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

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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 <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>
This commit is contained in:
Chunfeng Yun 2020-07-10 13:57:52 +08:00 committed by Greg Kroah-Hartman
parent e1e622d0d9
commit f1db23a67f
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/host/xhci-mtk-sch.c
View file

@ -275,6 +275,10 @@ 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;
}