USB: xhci: Remove the arbitrary limit of 15 xHCI ports

Our virtual xHCI device can have as many ports as we like - I've tested
this patch with 31.

Signed-off-by: William Gulland <wgulland@vmware.com>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 12 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 325b47a267b9..a1a7a9795536 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -298,7 +298,6 @@ error:
  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
  * Ports are 0-indexed from the HCD point of view,
  * and 1-indexed from the USB core pointer of view.
- * xHCI instances can have up to 127 ports, so FIXME if you see more than 15.
  *
  * Note that the status change bits will be cleared as soon as a port status
  * change event is generated, so we use the saved status from that event.
@@ -315,14 +314,9 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 
         /* Initial status is no changes */
-        buf[0] = 0;
+        retval = (ports + 8) / 8;
+        memset(buf, 0, retval);
         status = 0;
-        if (ports > 7) {
-                buf[1] = 0;
-                retval = 2;
-        } else {
-                retval = 1;
-        }
 
         spin_lock_irqsave(&xhci->lock, flags);
         /* For each port, did anything change?  If so, set that bit in buf. */
@@ -331,10 +325,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
                         NUM_PORT_REGS*i;
                 temp = xhci_readl(xhci, addr);
                 if (temp & (PORT_CSC | PORT_PEC | PORT_OCC)) {
-                        if (i < 7)
-                                buf[0] |= 1 << (i + 1);
-                        else
-                                buf[1] |= 1 << (i - 7);
+                        buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
                         status = 1;
                 }
         }