linux-kernel - [PATCH v1] usb: musb: Balance list entry in musb_gadget

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Date:   Thu, 21 Oct 2021 11:36:44 +0200
From:   viraj.shah@...utronix.de
To:     b-liu@...com
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] usb: musb: Balance list entry in musb_gadget_queue

From: Viraj Shah <viraj.shah@...utronix.de>

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: ea2f35c01d5ea ("usb: musb: Fix sleeping function called from invalid context for hdrc glue")
Signed-off-by: Viraj Shah <viraj.shah@...utronix.de>
---
 drivers/usb/musb/musb_gadget.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 98c0f4c1bffd..51274b87f46c 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -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:
-- 
2.30.2