usb: gadget: u_serial: Avoid spinlock recursion in __gs_console_push

[ Upstream commit e5990469943c711cb00bfde6338d2add6c6d0bfe ]

When serial console over USB is enabled, gs_console_connect
queues gs_console_work, where it acquires the spinlock and
queues the usb request, and this request goes to gadget layer.
Now consider a situation where gadget layer prints something
to dmesg, this will eventually call gs_console_write() which
requires cons->lock. And this causes spinlock recursion. Avoid
this by excluding usb_ep_queue from the spinlock.

 spin_lock_irqsave //needs cons->lock
 gs_console_write
	.
	.
 _printk
 __warn_printk
 dev_warn/pr_err
	.
	.
 [USB Gadget Layer]
	.
	.
 usb_ep_queue
 gs_console_work
 __gs_console_push // acquires cons->lock
 process_one_work

Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Link: https://lore.kernel.org/r/1683638872-6885-1-git-send-email-quic_prashk@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index ea2c5b6cde8cd69b410725d40b6c270221706e4e..3c51355ccc94df1b67bc693cb12a843b6c417591 100644 (file)
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -915,8 +915,11 @@ static void __gs_console_push(struct gs_console *cons)
        }
 
        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)