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xhci: Handle MaxPSASize == 0

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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Hans de Goede 2013-11-15 12:14:38 +01:00 committed by Sarah Sharp
parent 84c1e40fd7
commit f7920884eb
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/host/xhci.c
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@ -3138,6 +3138,12 @@ int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
xhci_dbg(xhci, "Driver wants %u stream IDs (including stream 0).\n",
num_streams);
/* MaxPSASize value 0 (2 streams) means streams are not supported */
if (HCC_MAX_PSA(xhci->hcc_params) < 4) {
xhci_dbg(xhci, "xHCI controller does not support streams.\n");
return -ENOSYS;
}
config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
if (!config_cmd) {
xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");