From 5aba179c34291ef67206bce6fa0fe0873c8dfc4e Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Thu, 19 Jan 2023 11:33:22 +0800 Subject: usb: mtu3: fix the failure of qmu stop This happens when do stress test of uvc stream on/off which will enable/disable endpoints. uvc has four tx requests, and may disable endpoint between queue tx requests as following: enable ep --> start qmu queue tx request0 queue tx request1 queue tx request2 --> resume qmu disable ep --> stop qmu may fail [1] queue tx request3 --> will resume qmu, may cause qmu can't work when enable ep next time [2] [1]: when the tx fifo has some data to transmit, and try to stop qmu (stop ep) meanwhile resume qmu (queue tx request), it may cause stop qmu timeout, then can be fixed by flushing fifo when stop qmu. [2]: it resumes qmu again, shall stop qmu again. Signed-off-by: Chunfeng Yun Reported-by: Min Guo Link: https://lore.kernel.org/r/20230119033322.21426-1-chunfeng.yun@mediatek.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/mtu3/mtu3_gadget.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/usb/mtu3/mtu3_gadget.c') diff --git a/drivers/usb/mtu3/mtu3_gadget.c b/drivers/usb/mtu3/mtu3_gadget.c index 80236e7b0895..c0264d5426bf 100644 --- a/drivers/usb/mtu3/mtu3_gadget.c +++ b/drivers/usb/mtu3/mtu3_gadget.c @@ -133,10 +133,9 @@ static int mtu3_ep_disable(struct mtu3_ep *mep) { struct mtu3 *mtu = mep->mtu; - mtu3_qmu_stop(mep); - /* abort all pending requests */ nuke(mep, -ESHUTDOWN); + mtu3_qmu_stop(mep); mtu3_deconfig_ep(mtu, mep); mtu3_gpd_ring_free(mep); -- cgit