linux-kernel - [PATCH 5.12 225/296] usb: cdnsp: Fix lack of removing request from pending list.

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Date:   Mon, 31 May 2021 15:14:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pawel Laszczak <pawell@...ence.com>,
        Peter Chen <peter.chen@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 225/296] usb: cdnsp: Fix lack of removing request from pending list.

From: Pawel Laszczak <pawell@...ence.com>

[ Upstream commit 3b414d1b0107fa51ad6063de9752d4b2a8063980 ]

Patch fixes lack of removing request from ep->pending_list on failure
of the stop endpoint command. Driver even after failing this command
must remove request from ep->pending_list.
Without this fix driver can stuck in cdnsp_gadget_ep_disable function
in loop:
        while (!list_empty(&pep->pending_list)) {
                preq = next_request(&pep->pending_list);
                cdnsp_ep_dequeue(pep, preq);
        }

Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Link: https://lore.kernel.org/r/20210420042813.34917-1-pawell@gli-login.cadence.com
Signed-off-by: Peter Chen <peter.chen@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/cdns3/cdnsp-gadget.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
index 56707b6b0f57..c083985e387b 100644
--- a/drivers/usb/cdns3/cdnsp-gadget.c
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -422,17 +422,17 @@ unmap:
 int cdnsp_ep_dequeue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
 {
 	struct cdnsp_device *pdev = pep->pdev;
-	int ret;
+	int ret_stop = 0;
+	int ret_rem;
 
 	trace_cdnsp_request_dequeue(preq);
 
-	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_RUNNING) {
-		ret = cdnsp_cmd_stop_ep(pdev, pep);
-		if (ret)
-			return ret;
-	}
+	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_RUNNING)
+		ret_stop = cdnsp_cmd_stop_ep(pdev, pep);
+
+	ret_rem = cdnsp_remove_request(pdev, preq, pep);
 
-	return cdnsp_remove_request(pdev, preq, pep);
+	return ret_rem ? ret_rem : ret_stop;
 }
 
 static void cdnsp_zero_in_ctx(struct cdnsp_device *pdev)
-- 
2.30.2