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

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commit 5ce1a24dd9 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 Chris
parent 4de3323b3c
commit 810d40826e
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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@@ -284,6 +284,10 @@ 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;
}