linux-kernel - [PATCH] usb: dwc3: ep0: Don't reset resource alloc flag (including ep0)

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Message-Id: <20240814-dwc3hwep0reset-v1-1-087b0d26f3d0@pengutronix.de>
Date: Wed, 14 Aug 2024 19:39:05 +0200
From: Michael Grzeschik <m.grzeschik@...gutronix.de>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org, Michael Grzeschik <m.grzeschik@...gutronix.de>
Subject: [PATCH] usb: dwc3: ep0: Don't reset resource alloc flag (including
 ep0)

The DWC3_EP_RESOURCE_ALLOCATED flag ensures that the resource of an
endpoint is only assigned once. Unless the endpoint is reset, don't
clear this flag. Otherwise we may set endpoint resource again, which
prevents the driver from initiate transfer after handling a STALL or
endpoint halt to the control endpoint.

Commit f2e0eee47038 (usb: dwc3: ep0: Don't reset resource alloc flag)
was fixing the initial issue, but did this only for physical ep1. Since
the function dwc3_ep0_stall_and_restart is resetting the flags for both
physical endpoints, this also has to be done for ep0.

Cc: stable@...r.kernel.org
Fixes: b311048c174d ("usb: dwc3: gadget: Rewrite endpoint allocation flow")
Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
 drivers/usb/dwc3/ep0.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index d96ffbe520397..c9533a99e47c8 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -232,7 +232,8 @@ void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
 	/* stall is always issued on EP0 */
 	dep = dwc->eps[0];
 	__dwc3_gadget_ep_set_halt(dep, 1, false);
-	dep->flags = DWC3_EP_ENABLED;
+	dep->flags &= DWC3_EP_RESOURCE_ALLOCATED;
+	dep->flags |= DWC3_EP_ENABLED;
 	dwc->delayed_status = false;
 
 	if (!list_empty(&dep->pending_list)) {

---
base-commit: 38343be0bf9a7d7ef0d160da5f2db887a0e29b62
change-id: 20240814-dwc3hwep0reset-b4d371873494

Best regards,
-- 
Michael Grzeschik <m.grzeschik@...gutronix.de>