From 1d91547f2fc88fb3cc7e82c17026c1acffc38c38 Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Fri, 10 Jul 2020 13:57:52 +0800 Subject: [PATCH] usb: xhci-mtk: fix the failure of bandwidth allocation commit 5ce1a24dd98c00a57a8fa13660648abf7e08e3ef upstream. The wMaxPacketSize field of endpoint descriptor may be zero as default value in alternate interface, and they are not actually selected when start stream, so skip them when try to allocate bandwidth. Cc: stable Fixes: 0cbd4b34cda9 ("xhci: mediatek: support MTK xHCI host controller") Signed-off-by: Chunfeng Yun Link: https://lore.kernel.org/r/1594360672-2076-1-git-send-email-chunfeng.yun@mediatek.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-mtk-sch.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c index fea555570ad4..45c54d56ecbd 100644 --- a/drivers/usb/host/xhci-mtk-sch.c +++ b/drivers/usb/host/xhci-mtk-sch.c @@ -557,6 +557,10 @@ static bool need_bw_sch(struct usb_host_endpoint *ep, if (is_fs_or_ls(speed) && !has_tt) return false; + /* skip endpoint with zero maxpkt */ + if (usb_endpoint_maxp(&ep->desc) == 0) + return false; + return true; }