USB: xhci: replace if-elseif-else with switch-case

Replace if-elseif-else with switch-case
to keep the code consistent which is semantically same

Switch-case is used here,
http://www.spinics.net/lists/linux-usb/msg17201.html
Making consistent at other places in usb/core

Also easier to read and maintain when USB4.0, 5.0, ... comes

Signed-off-by: Viral Mehta <viral.mehta@einfochips.com>
Tested-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 18 insertions, 7 deletions

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 1609623ec829..ce3f453f02ef 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -488,28 +488,39 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
                 switch (wValue & 0xff00) {
                 case USB_DT_DEVICE << 8:
-                        if (hcd->driver->flags & HCD_USB3)
+                        switch (hcd->driver->flags & HCD_MASK) {
+                        case HCD_USB3:
                                 bufp = usb3_rh_dev_descriptor;
-                        else if (hcd->driver->flags & HCD_USB2)
+                                break;
+                        case HCD_USB2:
                                 bufp = usb2_rh_dev_descriptor;
-                        else if (hcd->driver->flags & HCD_USB11)
+                                break;
+                        case HCD_USB11:
                                 bufp = usb11_rh_dev_descriptor;
-                        else
+                                break;
+                        default:
                                 goto error;
+                        }
                         len = 18;
                         if (hcd->has_tt)
                                 patch_protocol = 1;
                         break;
                 case USB_DT_CONFIG << 8:
-                        if (hcd->driver->flags & HCD_USB3) {
+                        switch (hcd->driver->flags & HCD_MASK) {
+                        case HCD_USB3:
                                 bufp = ss_rh_config_descriptor;
                                 len = sizeof ss_rh_config_descriptor;
-                        } else if (hcd->driver->flags & HCD_USB2) {
+                                break;
+                        case HCD_USB2:
                                 bufp = hs_rh_config_descriptor;
                                 len = sizeof hs_rh_config_descriptor;
-                        } else {
+                                break;
+                        case HCD_USB11:
                                 bufp = fs_rh_config_descriptor;
                                 len = sizeof fs_rh_config_descriptor;
+                                break;
+                        default:
+                                goto error;
                         }
                         if (device_can_wakeup(&hcd->self.root_hub->dev))
                                 patch_wakeup = 1;