// SPDX-License-Identifier: GPL-2.0
|
/*
|
* USB Attached SCSI
|
* Note that this is not the same as the USB Mass Storage driver
|
*
|
* Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
|
* Copyright Matthew Wilcox for Intel Corp, 2010
|
* Copyright Sarah Sharp for Intel Corp, 2010
|
*/
|
|
#include <linux/blkdev.h>
|
#include <linux/slab.h>
|
#include <linux/types.h>
|
#include <linux/module.h>
|
#include <linux/usb.h>
|
#include <linux/usb_usual.h>
|
#include <linux/usb/hcd.h>
|
#include <linux/usb/storage.h>
|
#include <linux/usb/uas.h>
|
|
#include <scsi/scsi.h>
|
#include <scsi/scsi_eh.h>
|
#include <scsi/scsi_dbg.h>
|
#include <scsi/scsi_cmnd.h>
|
#include <scsi/scsi_device.h>
|
#include <scsi/scsi_host.h>
|
#include <scsi/scsi_tcq.h>
|
|
#include "uas-detect.h"
|
#include "scsiglue.h"
|
|
#define MAX_CMNDS 256
|
|
struct uas_dev_info {
|
struct usb_interface *intf;
|
struct usb_device *udev;
|
struct usb_anchor cmd_urbs;
|
struct usb_anchor sense_urbs;
|
struct usb_anchor data_urbs;
|
unsigned long flags;
|
int qdepth, resetting;
|
unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
|
unsigned use_streams:1;
|
unsigned shutdown:1;
|
struct scsi_cmnd *cmnd[MAX_CMNDS];
|
spinlock_t lock;
|
struct work_struct work;
|
struct work_struct scan_work; /* for async scanning */
|
};
|
|
enum {
|
SUBMIT_STATUS_URB = BIT(1),
|
ALLOC_DATA_IN_URB = BIT(2),
|
SUBMIT_DATA_IN_URB = BIT(3),
|
ALLOC_DATA_OUT_URB = BIT(4),
|
SUBMIT_DATA_OUT_URB = BIT(5),
|
ALLOC_CMD_URB = BIT(6),
|
SUBMIT_CMD_URB = BIT(7),
|
COMMAND_INFLIGHT = BIT(8),
|
DATA_IN_URB_INFLIGHT = BIT(9),
|
DATA_OUT_URB_INFLIGHT = BIT(10),
|
COMMAND_ABORTED = BIT(11),
|
IS_IN_WORK_LIST = BIT(12),
|
};
|
|
/* Overrides scsi_pointer */
|
struct uas_cmd_info {
|
unsigned int state;
|
unsigned int uas_tag;
|
struct urb *cmd_urb;
|
struct urb *data_in_urb;
|
struct urb *data_out_urb;
|
};
|
|
/* I hate forward declarations, but I actually have a loop */
|
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
|
struct uas_dev_info *devinfo);
|
static void uas_do_work(struct work_struct *work);
|
static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
|
static void uas_free_streams(struct uas_dev_info *devinfo);
|
static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
|
int status);
|
|
/*
|
* This driver needs its own workqueue, as we need to control memory allocation.
|
*
|
* In the course of error handling and power management uas_wait_for_pending_cmnds()
|
* needs to flush pending work items. In these contexts we cannot allocate memory
|
* by doing block IO as we would deadlock. For the same reason we cannot wait
|
* for anything allocating memory not heeding these constraints.
|
*
|
* So we have to control all work items that can be on the workqueue we flush.
|
* Hence we cannot share a queue and need our own.
|
*/
|
static struct workqueue_struct *workqueue;
|
|
static void uas_do_work(struct work_struct *work)
|
{
|
struct uas_dev_info *devinfo =
|
container_of(work, struct uas_dev_info, work);
|
struct uas_cmd_info *cmdinfo;
|
struct scsi_cmnd *cmnd;
|
unsigned long flags;
|
int i, err;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
if (devinfo->resetting)
|
goto out;
|
|
for (i = 0; i < devinfo->qdepth; i++) {
|
if (!devinfo->cmnd[i])
|
continue;
|
|
cmnd = devinfo->cmnd[i];
|
cmdinfo = (void *)&cmnd->SCp;
|
|
if (!(cmdinfo->state & IS_IN_WORK_LIST))
|
continue;
|
|
err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
|
if (!err)
|
cmdinfo->state &= ~IS_IN_WORK_LIST;
|
else
|
queue_work(workqueue, &devinfo->work);
|
}
|
out:
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
}
|
|
static void uas_scan_work(struct work_struct *work)
|
{
|
struct uas_dev_info *devinfo =
|
container_of(work, struct uas_dev_info, scan_work);
|
struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf);
|
|
dev_dbg(&devinfo->intf->dev, "starting scan\n");
|
scsi_scan_host(shost);
|
dev_dbg(&devinfo->intf->dev, "scan complete\n");
|
}
|
|
static void uas_add_work(struct uas_cmd_info *cmdinfo)
|
{
|
struct scsi_pointer *scp = (void *)cmdinfo;
|
struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
|
struct uas_dev_info *devinfo = cmnd->device->hostdata;
|
|
lockdep_assert_held(&devinfo->lock);
|
cmdinfo->state |= IS_IN_WORK_LIST;
|
queue_work(workqueue, &devinfo->work);
|
}
|
|
static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
|
{
|
struct uas_cmd_info *cmdinfo;
|
struct scsi_cmnd *cmnd;
|
unsigned long flags;
|
int i, err;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
for (i = 0; i < devinfo->qdepth; i++) {
|
if (!devinfo->cmnd[i])
|
continue;
|
|
cmnd = devinfo->cmnd[i];
|
cmdinfo = (void *)&cmnd->SCp;
|
uas_log_cmd_state(cmnd, __func__, 0);
|
/* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
|
cmdinfo->state &= ~COMMAND_INFLIGHT;
|
cmnd->result = result << 16;
|
err = uas_try_complete(cmnd, __func__);
|
WARN_ON(err != 0);
|
}
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
}
|
|
static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
|
{
|
struct sense_iu *sense_iu = urb->transfer_buffer;
|
struct scsi_device *sdev = cmnd->device;
|
|
if (urb->actual_length > 16) {
|
unsigned len = be16_to_cpup(&sense_iu->len);
|
if (len + 16 != urb->actual_length) {
|
int newlen = min(len + 16, urb->actual_length) - 16;
|
if (newlen < 0)
|
newlen = 0;
|
sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
|
"disagrees with IU sense data length %d, "
|
"using %d bytes of sense data\n", __func__,
|
urb->actual_length, len, newlen);
|
len = newlen;
|
}
|
memcpy(cmnd->sense_buffer, sense_iu->sense, len);
|
}
|
|
cmnd->result = sense_iu->status;
|
}
|
|
static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
|
int status)
|
{
|
struct uas_cmd_info *ci = (void *)&cmnd->SCp;
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
|
if (status == -ENODEV) /* too late */
|
return;
|
|
scmd_printk(KERN_INFO, cmnd,
|
"%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
|
prefix, status, cmdinfo->uas_tag,
|
(ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
|
(ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
|
(ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
|
(ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
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(ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
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(ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
|
(ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
|
(ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
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(ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
|
(ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
|
(ci->state & COMMAND_ABORTED) ? " abort" : "",
|
(ci->state & IS_IN_WORK_LIST) ? " work" : "");
|
scsi_print_command(cmnd);
|
}
|
|
static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
|
{
|
struct uas_cmd_info *cmdinfo;
|
|
if (!cmnd)
|
return;
|
|
cmdinfo = (void *)&cmnd->SCp;
|
|
if (cmdinfo->state & SUBMIT_CMD_URB)
|
usb_free_urb(cmdinfo->cmd_urb);
|
|
/* data urbs may have never gotten their submit flag set */
|
if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
|
usb_free_urb(cmdinfo->data_in_urb);
|
if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
|
usb_free_urb(cmdinfo->data_out_urb);
|
}
|
|
static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
|
{
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
|
|
lockdep_assert_held(&devinfo->lock);
|
if (cmdinfo->state & (COMMAND_INFLIGHT |
|
DATA_IN_URB_INFLIGHT |
|
DATA_OUT_URB_INFLIGHT |
|
COMMAND_ABORTED))
|
return -EBUSY;
|
devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
|
uas_free_unsubmitted_urbs(cmnd);
|
cmnd->scsi_done(cmnd);
|
return 0;
|
}
|
|
static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
|
unsigned direction)
|
{
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
int err;
|
|
cmdinfo->state |= direction | SUBMIT_STATUS_URB;
|
err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
|
if (err) {
|
uas_add_work(cmdinfo);
|
}
|
}
|
|
static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
|
{
|
u8 response_code = riu->response_code;
|
|
switch (response_code) {
|
case RC_INCORRECT_LUN:
|
set_host_byte(cmnd, DID_BAD_TARGET);
|
break;
|
case RC_TMF_SUCCEEDED:
|
set_host_byte(cmnd, DID_OK);
|
break;
|
case RC_TMF_NOT_SUPPORTED:
|
set_host_byte(cmnd, DID_TARGET_FAILURE);
|
break;
|
default:
|
uas_log_cmd_state(cmnd, "response iu", response_code);
|
set_host_byte(cmnd, DID_ERROR);
|
break;
|
}
|
|
return response_code == RC_TMF_SUCCEEDED;
|
}
|
|
static void uas_stat_cmplt(struct urb *urb)
|
{
|
struct iu *iu = urb->transfer_buffer;
|
struct Scsi_Host *shost = urb->context;
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
struct urb *data_in_urb = NULL;
|
struct urb *data_out_urb = NULL;
|
struct scsi_cmnd *cmnd;
|
struct uas_cmd_info *cmdinfo;
|
unsigned long flags;
|
unsigned int idx;
|
int status = urb->status;
|
bool success;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
if (devinfo->resetting)
|
goto out;
|
|
if (status) {
|
if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
|
dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
|
goto out;
|
}
|
|
idx = be16_to_cpup(&iu->tag) - 1;
|
if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
|
dev_err(&urb->dev->dev,
|
"stat urb: no pending cmd for uas-tag %d\n", idx + 1);
|
goto out;
|
}
|
|
cmnd = devinfo->cmnd[idx];
|
cmdinfo = (void *)&cmnd->SCp;
|
|
if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
|
uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
|
goto out;
|
}
|
|
switch (iu->iu_id) {
|
case IU_ID_STATUS:
|
uas_sense(urb, cmnd);
|
if (cmnd->result != 0) {
|
/* cancel data transfers on error */
|
data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
|
data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
|
}
|
cmdinfo->state &= ~COMMAND_INFLIGHT;
|
uas_try_complete(cmnd, __func__);
|
break;
|
case IU_ID_READ_READY:
|
if (!cmdinfo->data_in_urb ||
|
(cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
|
uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
|
break;
|
}
|
uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
|
break;
|
case IU_ID_WRITE_READY:
|
if (!cmdinfo->data_out_urb ||
|
(cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
|
uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
|
break;
|
}
|
uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
|
break;
|
case IU_ID_RESPONSE:
|
cmdinfo->state &= ~COMMAND_INFLIGHT;
|
success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
|
if (!success) {
|
/* Error, cancel data transfers */
|
data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
|
data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
|
}
|
uas_try_complete(cmnd, __func__);
|
break;
|
default:
|
uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
|
}
|
out:
|
usb_free_urb(urb);
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
/* Unlinking of data urbs must be done without holding the lock */
|
if (data_in_urb) {
|
usb_unlink_urb(data_in_urb);
|
usb_put_urb(data_in_urb);
|
}
|
if (data_out_urb) {
|
usb_unlink_urb(data_out_urb);
|
usb_put_urb(data_out_urb);
|
}
|
}
|
|
static void uas_data_cmplt(struct urb *urb)
|
{
|
struct scsi_cmnd *cmnd = urb->context;
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
|
struct scsi_data_buffer *sdb = &cmnd->sdb;
|
unsigned long flags;
|
int status = urb->status;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
if (cmdinfo->data_in_urb == urb) {
|
cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
|
cmdinfo->data_in_urb = NULL;
|
} else if (cmdinfo->data_out_urb == urb) {
|
cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
|
cmdinfo->data_out_urb = NULL;
|
}
|
|
if (devinfo->resetting)
|
goto out;
|
|
/* Data urbs should not complete before the cmd urb is submitted */
|
if (cmdinfo->state & SUBMIT_CMD_URB) {
|
uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
|
goto out;
|
}
|
|
if (status) {
|
if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
|
uas_log_cmd_state(cmnd, "data cmplt err", status);
|
/* error: no data transfered */
|
scsi_set_resid(cmnd, sdb->length);
|
} else {
|
scsi_set_resid(cmnd, sdb->length - urb->actual_length);
|
}
|
uas_try_complete(cmnd, __func__);
|
out:
|
usb_free_urb(urb);
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
}
|
|
static void uas_cmd_cmplt(struct urb *urb)
|
{
|
if (urb->status)
|
dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
|
|
usb_free_urb(urb);
|
}
|
|
static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
|
struct scsi_cmnd *cmnd,
|
enum dma_data_direction dir)
|
{
|
struct usb_device *udev = devinfo->udev;
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct urb *urb = usb_alloc_urb(0, gfp);
|
struct scsi_data_buffer *sdb = &cmnd->sdb;
|
unsigned int pipe = (dir == DMA_FROM_DEVICE)
|
? devinfo->data_in_pipe : devinfo->data_out_pipe;
|
|
if (!urb)
|
goto out;
|
usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
|
uas_data_cmplt, cmnd);
|
if (devinfo->use_streams)
|
urb->stream_id = cmdinfo->uas_tag;
|
urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
|
urb->sg = sdb->table.sgl;
|
out:
|
return urb;
|
}
|
|
static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
|
struct scsi_cmnd *cmnd)
|
{
|
struct usb_device *udev = devinfo->udev;
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct urb *urb = usb_alloc_urb(0, gfp);
|
struct sense_iu *iu;
|
|
if (!urb)
|
goto out;
|
|
iu = kzalloc(sizeof(*iu), gfp);
|
if (!iu)
|
goto free;
|
|
usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
|
uas_stat_cmplt, cmnd->device->host);
|
if (devinfo->use_streams)
|
urb->stream_id = cmdinfo->uas_tag;
|
urb->transfer_flags |= URB_FREE_BUFFER;
|
out:
|
return urb;
|
free:
|
usb_free_urb(urb);
|
return NULL;
|
}
|
|
static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
|
struct scsi_cmnd *cmnd)
|
{
|
struct usb_device *udev = devinfo->udev;
|
struct scsi_device *sdev = cmnd->device;
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct urb *urb = usb_alloc_urb(0, gfp);
|
struct command_iu *iu;
|
int len;
|
|
if (!urb)
|
goto out;
|
|
len = cmnd->cmd_len - 16;
|
if (len < 0)
|
len = 0;
|
len = ALIGN(len, 4);
|
iu = kzalloc(sizeof(*iu) + len, gfp);
|
if (!iu)
|
goto free;
|
|
iu->iu_id = IU_ID_COMMAND;
|
iu->tag = cpu_to_be16(cmdinfo->uas_tag);
|
iu->prio_attr = UAS_SIMPLE_TAG;
|
iu->len = len;
|
int_to_scsilun(sdev->lun, &iu->lun);
|
memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
|
|
usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
|
uas_cmd_cmplt, NULL);
|
urb->transfer_flags |= URB_FREE_BUFFER;
|
out:
|
return urb;
|
free:
|
usb_free_urb(urb);
|
return NULL;
|
}
|
|
/*
|
* Why should I request the Status IU before sending the Command IU? Spec
|
* says to, but also says the device may receive them in any order. Seems
|
* daft to me.
|
*/
|
|
static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
|
{
|
struct uas_dev_info *devinfo = cmnd->device->hostdata;
|
struct urb *urb;
|
int err;
|
|
urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
|
if (!urb)
|
return NULL;
|
usb_anchor_urb(urb, &devinfo->sense_urbs);
|
err = usb_submit_urb(urb, gfp);
|
if (err) {
|
usb_unanchor_urb(urb);
|
uas_log_cmd_state(cmnd, "sense submit err", err);
|
usb_free_urb(urb);
|
return NULL;
|
}
|
return urb;
|
}
|
|
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
|
struct uas_dev_info *devinfo)
|
{
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct urb *urb;
|
int err;
|
|
lockdep_assert_held(&devinfo->lock);
|
if (cmdinfo->state & SUBMIT_STATUS_URB) {
|
urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
|
if (!urb)
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
cmdinfo->state &= ~SUBMIT_STATUS_URB;
|
}
|
|
if (cmdinfo->state & ALLOC_DATA_IN_URB) {
|
cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
|
cmnd, DMA_FROM_DEVICE);
|
if (!cmdinfo->data_in_urb)
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
cmdinfo->state &= ~ALLOC_DATA_IN_URB;
|
}
|
|
if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
|
usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
|
err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
|
if (err) {
|
usb_unanchor_urb(cmdinfo->data_in_urb);
|
uas_log_cmd_state(cmnd, "data in submit err", err);
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
}
|
cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
|
cmdinfo->state |= DATA_IN_URB_INFLIGHT;
|
}
|
|
if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
|
cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
|
cmnd, DMA_TO_DEVICE);
|
if (!cmdinfo->data_out_urb)
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
|
}
|
|
if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
|
usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
|
err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
|
if (err) {
|
usb_unanchor_urb(cmdinfo->data_out_urb);
|
uas_log_cmd_state(cmnd, "data out submit err", err);
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
}
|
cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
|
cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
|
}
|
|
if (cmdinfo->state & ALLOC_CMD_URB) {
|
cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
|
if (!cmdinfo->cmd_urb)
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
cmdinfo->state &= ~ALLOC_CMD_URB;
|
}
|
|
if (cmdinfo->state & SUBMIT_CMD_URB) {
|
usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
|
err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
|
if (err) {
|
usb_unanchor_urb(cmdinfo->cmd_urb);
|
uas_log_cmd_state(cmnd, "cmd submit err", err);
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
}
|
cmdinfo->cmd_urb = NULL;
|
cmdinfo->state &= ~SUBMIT_CMD_URB;
|
cmdinfo->state |= COMMAND_INFLIGHT;
|
}
|
|
return 0;
|
}
|
|
static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
|
void (*done)(struct scsi_cmnd *))
|
{
|
struct scsi_device *sdev = cmnd->device;
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
unsigned long flags;
|
int idx, err;
|
|
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
|
|
/* Re-check scsi_block_requests now that we've the host-lock */
|
if (cmnd->device->host->host_self_blocked)
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
if ((devinfo->flags & US_FL_NO_ATA_1X) &&
|
(cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
|
memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
|
sizeof(usb_stor_sense_invalidCDB));
|
cmnd->result = SAM_STAT_CHECK_CONDITION;
|
cmnd->scsi_done(cmnd);
|
return 0;
|
}
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
if (devinfo->resetting) {
|
set_host_byte(cmnd, DID_ERROR);
|
cmnd->scsi_done(cmnd);
|
goto zombie;
|
}
|
|
/* Find a free uas-tag */
|
for (idx = 0; idx < devinfo->qdepth; idx++) {
|
if (!devinfo->cmnd[idx])
|
break;
|
}
|
if (idx == devinfo->qdepth) {
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
}
|
|
cmnd->scsi_done = done;
|
|
memset(cmdinfo, 0, sizeof(*cmdinfo));
|
cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
|
cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
|
|
switch (cmnd->sc_data_direction) {
|
case DMA_FROM_DEVICE:
|
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
|
break;
|
case DMA_BIDIRECTIONAL:
|
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
|
fallthrough;
|
case DMA_TO_DEVICE:
|
cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
|
case DMA_NONE:
|
break;
|
}
|
|
if (!devinfo->use_streams)
|
cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
|
|
err = uas_submit_urbs(cmnd, devinfo);
|
/*
|
* in case of fatal errors the SCSI layer is peculiar
|
* a command that has finished is a success for the purpose
|
* of queueing, no matter how fatal the error
|
*/
|
if (err == -ENODEV) {
|
set_host_byte(cmnd, DID_ERROR);
|
cmnd->scsi_done(cmnd);
|
goto zombie;
|
}
|
if (err) {
|
/* If we did nothing, give up now */
|
if (cmdinfo->state & SUBMIT_STATUS_URB) {
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
}
|
uas_add_work(cmdinfo);
|
}
|
|
devinfo->cmnd[idx] = cmnd;
|
zombie:
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
return 0;
|
}
|
|
static DEF_SCSI_QCMD(uas_queuecommand)
|
|
/*
|
* For now we do not support actually sending an abort to the device, so
|
* this eh always fails. Still we must define it to make sure that we've
|
* dropped all references to the cmnd in question once this function exits.
|
*/
|
static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
|
{
|
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
|
struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
|
struct urb *data_in_urb = NULL;
|
struct urb *data_out_urb = NULL;
|
unsigned long flags;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
uas_log_cmd_state(cmnd, __func__, 0);
|
|
/* Ensure that try_complete does not call scsi_done */
|
cmdinfo->state |= COMMAND_ABORTED;
|
|
/* Drop all refs to this cmnd, kill data urbs to break their ref */
|
devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
|
if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
|
data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
|
if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
|
data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
|
|
uas_free_unsubmitted_urbs(cmnd);
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
if (data_in_urb) {
|
usb_kill_urb(data_in_urb);
|
usb_put_urb(data_in_urb);
|
}
|
if (data_out_urb) {
|
usb_kill_urb(data_out_urb);
|
usb_put_urb(data_out_urb);
|
}
|
|
return FAILED;
|
}
|
|
static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
|
{
|
struct scsi_device *sdev = cmnd->device;
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
struct usb_device *udev = devinfo->udev;
|
unsigned long flags;
|
int err;
|
|
err = usb_lock_device_for_reset(udev, devinfo->intf);
|
if (err) {
|
shost_printk(KERN_ERR, sdev->host,
|
"%s FAILED to get lock err %d\n", __func__, err);
|
return FAILED;
|
}
|
|
shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
devinfo->resetting = 1;
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
|
usb_kill_anchored_urbs(&devinfo->sense_urbs);
|
usb_kill_anchored_urbs(&devinfo->data_urbs);
|
uas_zap_pending(devinfo, DID_RESET);
|
|
err = usb_reset_device(udev);
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
devinfo->resetting = 0;
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
usb_unlock_device(udev);
|
|
if (err) {
|
shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
|
__func__, err);
|
return FAILED;
|
}
|
|
shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
|
return SUCCESS;
|
}
|
|
static int uas_target_alloc(struct scsi_target *starget)
|
{
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)
|
dev_to_shost(starget->dev.parent)->hostdata;
|
|
if (devinfo->flags & US_FL_NO_REPORT_LUNS)
|
starget->no_report_luns = 1;
|
|
return 0;
|
}
|
|
static int uas_slave_alloc(struct scsi_device *sdev)
|
{
|
struct uas_dev_info *devinfo =
|
(struct uas_dev_info *)sdev->host->hostdata;
|
|
sdev->hostdata = devinfo;
|
|
/*
|
* The protocol has no requirements on alignment in the strict sense.
|
* Controllers may or may not have alignment restrictions.
|
* As this is not exported, we use an extremely conservative guess.
|
*/
|
blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
|
|
if (devinfo->flags & US_FL_MAX_SECTORS_64)
|
blk_queue_max_hw_sectors(sdev->request_queue, 64);
|
else if (devinfo->flags & US_FL_MAX_SECTORS_240)
|
blk_queue_max_hw_sectors(sdev->request_queue, 240);
|
|
return 0;
|
}
|
|
static int uas_slave_configure(struct scsi_device *sdev)
|
{
|
struct uas_dev_info *devinfo = sdev->hostdata;
|
|
if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
|
sdev->no_report_opcodes = 1;
|
|
/* A few buggy USB-ATA bridges don't understand FUA */
|
if (devinfo->flags & US_FL_BROKEN_FUA)
|
sdev->broken_fua = 1;
|
|
/* UAS also needs to support FL_ALWAYS_SYNC */
|
if (devinfo->flags & US_FL_ALWAYS_SYNC) {
|
sdev->skip_ms_page_3f = 1;
|
sdev->skip_ms_page_8 = 1;
|
sdev->wce_default_on = 1;
|
}
|
|
/* Some disks cannot handle READ_CAPACITY_16 */
|
if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
|
sdev->no_read_capacity_16 = 1;
|
|
/* Some disks cannot handle WRITE_SAME */
|
if (devinfo->flags & US_FL_NO_SAME)
|
sdev->no_write_same = 1;
|
/*
|
* Some disks return the total number of blocks in response
|
* to READ CAPACITY rather than the highest block number.
|
* If this device makes that mistake, tell the sd driver.
|
*/
|
if (devinfo->flags & US_FL_FIX_CAPACITY)
|
sdev->fix_capacity = 1;
|
|
/*
|
* in some cases we have to guess
|
*/
|
if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
|
sdev->guess_capacity = 1;
|
|
/*
|
* Some devices don't like MODE SENSE with page=0x3f,
|
* which is the command used for checking if a device
|
* is write-protected. Now that we tell the sd driver
|
* to do a 192-byte transfer with this command the
|
* majority of devices work fine, but a few still can't
|
* handle it. The sd driver will simply assume those
|
* devices are write-enabled.
|
*/
|
if (devinfo->flags & US_FL_NO_WP_DETECT)
|
sdev->skip_ms_page_3f = 1;
|
|
scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
|
return 0;
|
}
|
|
static struct scsi_host_template uas_host_template = {
|
.module = THIS_MODULE,
|
.name = "uas",
|
.queuecommand = uas_queuecommand,
|
.target_alloc = uas_target_alloc,
|
.slave_alloc = uas_slave_alloc,
|
.slave_configure = uas_slave_configure,
|
.eh_abort_handler = uas_eh_abort_handler,
|
.eh_device_reset_handler = uas_eh_device_reset_handler,
|
.this_id = -1,
|
.skip_settle_delay = 1,
|
.dma_boundary = PAGE_SIZE - 1,
|
};
|
|
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
|
vendorName, productName, useProtocol, useTransport, \
|
initFunction, flags) \
|
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
|
.driver_info = (flags) }
|
|
static struct usb_device_id uas_usb_ids[] = {
|
# include "unusual_uas.h"
|
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
|
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
|
|
#undef UNUSUAL_DEV
|
|
static int uas_switch_interface(struct usb_device *udev,
|
struct usb_interface *intf)
|
{
|
struct usb_host_interface *alt;
|
|
alt = uas_find_uas_alt_setting(intf);
|
if (!alt)
|
return -ENODEV;
|
|
return usb_set_interface(udev, alt->desc.bInterfaceNumber,
|
alt->desc.bAlternateSetting);
|
}
|
|
static int uas_configure_endpoints(struct uas_dev_info *devinfo)
|
{
|
struct usb_host_endpoint *eps[4] = { };
|
struct usb_device *udev = devinfo->udev;
|
int r;
|
|
r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
|
if (r)
|
return r;
|
|
devinfo->cmd_pipe = usb_sndbulkpipe(udev,
|
usb_endpoint_num(&eps[0]->desc));
|
devinfo->status_pipe = usb_rcvbulkpipe(udev,
|
usb_endpoint_num(&eps[1]->desc));
|
devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
|
usb_endpoint_num(&eps[2]->desc));
|
devinfo->data_out_pipe = usb_sndbulkpipe(udev,
|
usb_endpoint_num(&eps[3]->desc));
|
|
if (udev->speed < USB_SPEED_SUPER) {
|
devinfo->qdepth = 32;
|
devinfo->use_streams = 0;
|
} else {
|
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
|
3, MAX_CMNDS, GFP_NOIO);
|
if (devinfo->qdepth < 0)
|
return devinfo->qdepth;
|
devinfo->use_streams = 1;
|
}
|
|
return 0;
|
}
|
|
static void uas_free_streams(struct uas_dev_info *devinfo)
|
{
|
struct usb_device *udev = devinfo->udev;
|
struct usb_host_endpoint *eps[3];
|
|
eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
|
eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
|
eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
|
usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
|
}
|
|
static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
{
|
int result = -ENOMEM;
|
struct Scsi_Host *shost = NULL;
|
struct uas_dev_info *devinfo;
|
struct usb_device *udev = interface_to_usbdev(intf);
|
unsigned long dev_flags;
|
|
if (!uas_use_uas_driver(intf, id, &dev_flags))
|
return -ENODEV;
|
|
if (uas_switch_interface(udev, intf))
|
return -ENODEV;
|
|
shost = scsi_host_alloc(&uas_host_template,
|
sizeof(struct uas_dev_info));
|
if (!shost)
|
goto set_alt0;
|
|
shost->max_cmd_len = 16 + 252;
|
shost->max_id = 1;
|
shost->max_lun = 256;
|
shost->max_channel = 0;
|
shost->sg_tablesize = udev->bus->sg_tablesize;
|
|
devinfo = (struct uas_dev_info *)shost->hostdata;
|
devinfo->intf = intf;
|
devinfo->udev = udev;
|
devinfo->resetting = 0;
|
devinfo->shutdown = 0;
|
devinfo->flags = dev_flags;
|
init_usb_anchor(&devinfo->cmd_urbs);
|
init_usb_anchor(&devinfo->sense_urbs);
|
init_usb_anchor(&devinfo->data_urbs);
|
spin_lock_init(&devinfo->lock);
|
INIT_WORK(&devinfo->work, uas_do_work);
|
INIT_WORK(&devinfo->scan_work, uas_scan_work);
|
|
result = uas_configure_endpoints(devinfo);
|
if (result)
|
goto set_alt0;
|
|
/*
|
* 1 tag is reserved for untagged commands +
|
* 1 tag to avoid off by one errors in some bridge firmwares
|
*/
|
shost->can_queue = devinfo->qdepth - 2;
|
|
usb_set_intfdata(intf, shost);
|
result = scsi_add_host(shost, &intf->dev);
|
if (result)
|
goto free_streams;
|
|
/* Submit the delayed_work for SCSI-device scanning */
|
schedule_work(&devinfo->scan_work);
|
|
return result;
|
|
free_streams:
|
uas_free_streams(devinfo);
|
usb_set_intfdata(intf, NULL);
|
set_alt0:
|
usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
|
if (shost)
|
scsi_host_put(shost);
|
return result;
|
}
|
|
static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
|
{
|
unsigned long flags;
|
int i, r = 1;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
|
for (i = 0; i < devinfo->qdepth; i++) {
|
if (devinfo->cmnd[i]) {
|
r = 0; /* Not empty */
|
break;
|
}
|
}
|
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
return r;
|
}
|
|
/*
|
* Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
|
* get empty while there still is more work to do due to sense-urbs completing
|
* with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
|
*/
|
static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
|
{
|
unsigned long start_time;
|
int r;
|
|
start_time = jiffies;
|
do {
|
flush_work(&devinfo->work);
|
|
r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
|
if (r == 0)
|
return -ETIME;
|
|
r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
|
if (r == 0)
|
return -ETIME;
|
|
if (time_after(jiffies, start_time + 5 * HZ))
|
return -ETIME;
|
} while (!uas_cmnd_list_empty(devinfo));
|
|
return 0;
|
}
|
|
static int uas_pre_reset(struct usb_interface *intf)
|
{
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
unsigned long flags;
|
|
if (devinfo->shutdown)
|
return 0;
|
|
/* Block new requests */
|
spin_lock_irqsave(shost->host_lock, flags);
|
scsi_block_requests(shost);
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
if (uas_wait_for_pending_cmnds(devinfo) != 0) {
|
shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
|
scsi_unblock_requests(shost);
|
return 1;
|
}
|
|
uas_free_streams(devinfo);
|
|
return 0;
|
}
|
|
static int uas_post_reset(struct usb_interface *intf)
|
{
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
unsigned long flags;
|
int err;
|
|
if (devinfo->shutdown)
|
return 0;
|
|
err = uas_configure_endpoints(devinfo);
|
if (err && err != -ENODEV)
|
shost_printk(KERN_ERR, shost,
|
"%s: alloc streams error %d after reset",
|
__func__, err);
|
|
/* we must unblock the host in every case lest we deadlock */
|
spin_lock_irqsave(shost->host_lock, flags);
|
scsi_report_bus_reset(shost, 0);
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
scsi_unblock_requests(shost);
|
|
return err ? 1 : 0;
|
}
|
|
static int uas_suspend(struct usb_interface *intf, pm_message_t message)
|
{
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
if (uas_wait_for_pending_cmnds(devinfo) != 0) {
|
shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
|
return -ETIME;
|
}
|
|
return 0;
|
}
|
|
static int uas_resume(struct usb_interface *intf)
|
{
|
return 0;
|
}
|
|
static int uas_reset_resume(struct usb_interface *intf)
|
{
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
unsigned long flags;
|
int err;
|
|
err = uas_configure_endpoints(devinfo);
|
if (err) {
|
shost_printk(KERN_ERR, shost,
|
"%s: alloc streams error %d after reset",
|
__func__, err);
|
return -EIO;
|
}
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
scsi_report_bus_reset(shost, 0);
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
return 0;
|
}
|
|
static void uas_disconnect(struct usb_interface *intf)
|
{
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
unsigned long flags;
|
|
spin_lock_irqsave(&devinfo->lock, flags);
|
devinfo->resetting = 1;
|
spin_unlock_irqrestore(&devinfo->lock, flags);
|
|
cancel_work_sync(&devinfo->work);
|
usb_kill_anchored_urbs(&devinfo->cmd_urbs);
|
usb_kill_anchored_urbs(&devinfo->sense_urbs);
|
usb_kill_anchored_urbs(&devinfo->data_urbs);
|
uas_zap_pending(devinfo, DID_NO_CONNECT);
|
|
/*
|
* Prevent SCSI scanning (if it hasn't started yet)
|
* or wait for the SCSI-scanning routine to stop.
|
*/
|
cancel_work_sync(&devinfo->scan_work);
|
|
scsi_remove_host(shost);
|
uas_free_streams(devinfo);
|
scsi_host_put(shost);
|
}
|
|
/*
|
* Put the device back in usb-storage mode on shutdown, as some BIOS-es
|
* hang on reboot when the device is still in uas mode. Note the reset is
|
* necessary as some devices won't revert to usb-storage mode without it.
|
*/
|
static void uas_shutdown(struct device *dev)
|
{
|
struct usb_interface *intf = to_usb_interface(dev);
|
struct usb_device *udev = interface_to_usbdev(intf);
|
struct Scsi_Host *shost = usb_get_intfdata(intf);
|
struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
|
|
if (system_state != SYSTEM_RESTART)
|
return;
|
|
devinfo->shutdown = 1;
|
uas_free_streams(devinfo);
|
usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
|
usb_reset_device(udev);
|
}
|
|
static struct usb_driver uas_driver = {
|
.name = "uas",
|
.probe = uas_probe,
|
.disconnect = uas_disconnect,
|
.pre_reset = uas_pre_reset,
|
.post_reset = uas_post_reset,
|
.suspend = uas_suspend,
|
.resume = uas_resume,
|
.reset_resume = uas_reset_resume,
|
.drvwrap.driver.shutdown = uas_shutdown,
|
.id_table = uas_usb_ids,
|
};
|
|
static int __init uas_init(void)
|
{
|
int rv;
|
|
workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
|
if (!workqueue)
|
return -ENOMEM;
|
|
rv = usb_register(&uas_driver);
|
if (rv) {
|
destroy_workqueue(workqueue);
|
return -ENOMEM;
|
}
|
|
return 0;
|
}
|
|
static void __exit uas_exit(void)
|
{
|
usb_deregister(&uas_driver);
|
destroy_workqueue(workqueue);
|
}
|
|
module_init(uas_init);
|
module_exit(uas_exit);
|
|
MODULE_LICENSE("GPL");
|
MODULE_IMPORT_NS(USB_STORAGE);
|
MODULE_AUTHOR(
|
"Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
|
