linux-kernel - [PATCH v2] usb: image: mdc800: kill download URB on timeout

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Message-Id: <20260209151937.2247202-1-n7l8m4@u.northwestern.edu>
Date: Mon,  9 Feb 2026 15:19:37 +0000
From: Ziyi Guo <n7l8m4@...orthwestern.edu>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ziyi Guo <n7l8m4@...orthwestern.edu>
Subject: [PATCH v2] usb: image: mdc800: kill download URB on timeout

mdc800_device_read() submits download_urb and waits for completion.
If the timeout fires and the device has not responded, the function
returns without killing the URB, leaving it active.

A subsequent read() resubmits the same URB while it is still
in-flight, triggering the WARN in usb_submit_urb():

  "URB submitted while active"

Check the return value of wait_event_timeout() and kill the URB if
it indicates timeout, ensuring the URB is complete before its status
is inspected or the URB is resubmitted.

Similar to
- commit 372c93131998 ("USB: yurex: fix control-URB timeout handling")
- commit b98d5000c505 ("media: rc: iguanair: handle timeouts")

Signed-off-by: Ziyi Guo <n7l8m4@...orthwestern.edu>
---
v2:
 - Check the retval to see whether the URB completed normally or timed out.

 drivers/usb/image/mdc800.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/image/mdc800.c b/drivers/usb/image/mdc800.c
index 7b7e1554ea20..a47bac0fb04b 100644
--- a/drivers/usb/image/mdc800.c
+++ b/drivers/usb/image/mdc800.c
@@ -730,9 +730,11 @@ static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t l
 					mutex_unlock(&mdc800->io_lock);
 					return len-left;
 				}
-				wait_event_timeout(mdc800->download_wait,
+				retval = wait_event_timeout(mdc800->download_wait,
 				     mdc800->downloaded,
 				     msecs_to_jiffies(TO_DOWNLOAD_GET_READY));
+				if (!retval)
+					usb_kill_urb(mdc800->download_urb);
 				mdc800->downloaded = 0;
 				if (mdc800->download_urb->status != 0)
 				{
-- 
2.34.1