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/function/u_serial.c | 39 +++++++++++++++++++++++++++++++++------
1 files changed, 33 insertions(+), 6 deletions(-)
diff --git a/kernel/drivers/usb/gadget/function/u_serial.c b/kernel/drivers/usb/gadget/function/u_serial.c
index 1e59204..a4c5baf 100644
--- a/kernel/drivers/usb/gadget/function/u_serial.c
+++ b/kernel/drivers/usb/gadget/function/u_serial.c
@@ -81,6 +81,9 @@
#define WRITE_BUF_SIZE 8192 /* TX only */
#define GS_CONSOLE_BUF_SIZE 8192
+/* Prevents race conditions while accessing gser->ioport */
+static DEFINE_SPINLOCK(serial_port_lock);
+
/* console info */
struct gs_console {
struct console console;
@@ -912,8 +915,11 @@
}
req->length = size;
+
+ spin_unlock_irq(&cons->lock);
if (usb_ep_queue(ep, req, GFP_ATOMIC))
req->length = 0;
+ spin_lock_irq(&cons->lock);
}
static void gs_console_work(struct work_struct *work)
@@ -1374,8 +1380,10 @@
if (!port)
return;
+ spin_lock_irqsave(&serial_port_lock, flags);
+
/* tell the TTY glue not to do I/O here any more */
- spin_lock_irqsave(&port->port_lock, flags);
+ spin_lock(&port->port_lock);
gs_console_disconnect(port);
@@ -1390,7 +1398,8 @@
tty_hangup(port->port.tty);
}
port->suspended = false;
- spin_unlock_irqrestore(&port->port_lock, flags);
+ spin_unlock(&port->port_lock);
+ spin_unlock_irqrestore(&serial_port_lock, flags);
/* disable endpoints, aborting down any active I/O */
usb_ep_disable(gser->out);
@@ -1413,10 +1422,19 @@
void gserial_suspend(struct gserial *gser)
{
- struct gs_port *port = gser->ioport;
+ struct gs_port *port;
unsigned long flags;
- spin_lock_irqsave(&port->port_lock, flags);
+ spin_lock_irqsave(&serial_port_lock, flags);
+ port = gser->ioport;
+
+ if (!port) {
+ spin_unlock_irqrestore(&serial_port_lock, flags);
+ return;
+ }
+
+ spin_lock(&port->port_lock);
+ spin_unlock(&serial_port_lock);
port->suspended = true;
spin_unlock_irqrestore(&port->port_lock, flags);
}
@@ -1424,10 +1442,19 @@
void gserial_resume(struct gserial *gser)
{
- struct gs_port *port = gser->ioport;
+ struct gs_port *port;
unsigned long flags;
- spin_lock_irqsave(&port->port_lock, flags);
+ spin_lock_irqsave(&serial_port_lock, flags);
+ port = gser->ioport;
+
+ if (!port) {
+ spin_unlock_irqrestore(&serial_port_lock, flags);
+ return;
+ }
+
+ spin_lock(&port->port_lock);
+ spin_unlock(&serial_port_lock);
port->suspended = false;
if (!port->start_delayed) {
spin_unlock_irqrestore(&port->port_lock, flags);
--
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