From 2f7c68cb55ecb7331f2381deb497c27155f32faf Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 03 Jan 2024 09:43:39 +0000
Subject: [PATCH] update kernel to 5.10.198
---
kernel/drivers/usb/gadget/legacy/inode.c | 28 +++++++++++++++++++++-------
1 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/kernel/drivers/usb/gadget/legacy/inode.c b/kernel/drivers/usb/gadget/legacy/inode.c
index cd09747..cbe8016 100644
--- a/kernel/drivers/usb/gadget/legacy/inode.c
+++ b/kernel/drivers/usb/gadget/legacy/inode.c
@@ -229,6 +229,7 @@
*/
static const char *CHIP;
+static DEFINE_MUTEX(sb_mutex); /* Serialize superblock operations */
/*----------------------------------------------------------------------*/
@@ -2012,13 +2013,20 @@
{
struct inode *inode;
struct dev_data *dev;
+ int rc;
- if (the_device)
- return -ESRCH;
+ mutex_lock(&sb_mutex);
+
+ if (the_device) {
+ rc = -ESRCH;
+ goto Done;
+ }
CHIP = usb_get_gadget_udc_name();
- if (!CHIP)
- return -ENODEV;
+ if (!CHIP) {
+ rc = -ENODEV;
+ goto Done;
+ }
/* superblock */
sb->s_blocksize = PAGE_SIZE;
@@ -2055,13 +2063,17 @@
* from binding to a controller.
*/
the_device = dev;
- return 0;
+ rc = 0;
+ goto Done;
-Enomem:
+ Enomem:
kfree(CHIP);
CHIP = NULL;
+ rc = -ENOMEM;
- return -ENOMEM;
+ Done:
+ mutex_unlock(&sb_mutex);
+ return rc;
}
/* "mount -t gadgetfs path /dev/gadget" ends up here */
@@ -2083,6 +2095,7 @@
static void
gadgetfs_kill_sb (struct super_block *sb)
{
+ mutex_lock(&sb_mutex);
kill_litter_super (sb);
if (the_device) {
put_dev (the_device);
@@ -2090,6 +2103,7 @@
}
kfree(CHIP);
CHIP = NULL;
+ mutex_unlock(&sb_mutex);
}
/*----------------------------------------------------------------------*/
--
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