6.6-stable review patch. If anyone has any objections, please let me know.
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From: Michael Grzeschik m.grzeschik@pengutronix.de
[ Upstream commit 72fca8371f205d654f95b09cd023a71fd5307041 ]
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@vger.kernel.org Fixes: b311048c174d ("usb: dwc3: gadget: Rewrite endpoint allocation flow") Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Signed-off-by: Michael Grzeschik m.grzeschik@pengutronix.de Link: https://lore.kernel.org/r/20240814-dwc3hwep0reset-v2-1-29e1d7d923ea@pengutro... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: 5d2fb074dea2 ("usb: dwc3: ep0: Don't clear ep0 DWC3_EP_TRANSFER_STARTED") Signed-off-by: Sasha Levin sashal@kernel.org --- 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 72bb722da2f25..371662a552538 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -231,7 +231,8 @@ 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)) {