diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2013-11-15 12:14:38 +0100 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2014-03-04 15:38:14 -0800 |
| commit | f7920884eb640bc642f3b4e56f5237d30a080eda (patch) | |
| tree | dc1e764db7a17b33c630e804da3131cae2f3277e | |
| parent | 84c1e40fd794a883431fc7688f653d3faa0265f0 (diff) | |
xhci: Handle MaxPSASize == 0
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
| -rw-r--r-- | drivers/usb/host/xhci.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 6cb9c2235a0b..1db3c2794a49 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -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"); |