xhci: Handle MaxPSASize == 0

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

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");