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usb: ch9: fix up MaxStreams helper

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According to USB 3.0 Specification Table 9-22, if
bmAttributes [4:0] are set to zero, it means "no
streams supported", but the way this helper was
defined on Linux, we will *always* have one stream
which might cause several problems.

For example on DWC3, we would tell the controller
endpoint has streams enabled and yet start transfers
with Stream ID set to 0, which would goof up the host
side.

While doing that, convert the macro to an inline
function due to the different checks we now need.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Felipe Balbi 2012-01-02 13:35:41 +02:00 • committed by Greg Kroah-Hartman
parent e28dbb0661
commit 18b7ede5f7
3 changed files with 21 additions and 5 deletions
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3
drivers/usb/host/xhci.c
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@ -2799,8 +2799,7 @@ static int xhci_calculate_streams_and_bitmask(struct xhci_hcd *xhci,
if (ret < 0)
return ret;
max_streams = USB_SS_MAX_STREAMS(
eps[i]->ss_ep_comp.bmAttributes);
max_streams = usb_ss_max_streams(&eps[i]->ss_ep_comp);
if (max_streams < (*num_streams - 1)) {
xhci_dbg(xhci, "Ep 0x%x only supports %u stream IDs.\n",
eps[i]->desc.bEndpointAddress,