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usb: xhci-mtk: fix the failure of bandwidth allocation 

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 <stable@vger.kernel.org>
Fixes: 0cbd4b34cd ("xhci: mediatek: support MTK xHCI host controller")
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1594360672-2076-1-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-sugar-mainline-defconfig
Chunfeng Yun 2020-07-10 13:57:52 +08:00 committed by Greg Kroah-Hartman
parent ba47d845d7
commit 5ce1a24dd9
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/host/xhci-mtk-sch.c
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@ -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;
}