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usb: musb: Balance list entry in musb_gadget_queue

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musb_gadget_queue() adds the passed request to musb_ep::req_list. If the
endpoint is idle and it is the first request then it invokes
musb_queue_resume_work(). If the function returns an error then the
error is passed to the caller without any clean-up and the request
remains enqueued on the list. If the caller enqueues the request again
then the list corrupts.

Remove the request from the list on error.

Fixes: ea2f35c01d ("usb: musb: Fix sleeping function called from invalid context for hdrc glue")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Viraj Shah <viraj.shah@linutronix.de>
Link: https://lore.kernel.org/r/20211021093644.4734-1-viraj.shah@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Viraj Shah 2021-10-21 11:36:44 +02:00 committed by Greg Kroah-Hartman
parent 02f8b13603
commit 21b5fcdccb
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/musb/musb_gadget.c
View File

@ -1247,9 +1247,11 @@ static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req,
status = musb_queue_resume_work(musb,
musb_ep_restart_resume_work,
request);
if (status < 0)
if (status < 0) {
dev_err(musb->controller, "%s resume work: %i\n",
__func__, status);
list_del(&request->list);
}
}
unlock: