In xhci_hub_control(), there are many PORTSC register readbacks in several branches of the *switch* statement which get duplicated right after that *switch* by reading back that register once more -- which is done to flush the posted writes. Drop that redundant PORTSC readback... Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool. Signed-off-by: Sergey Shtylyov <s.shtylyov@xxxxxx> --- This patch is against the 'usb-next' branch of Greg KH's 'usb.git' repo. Changes in version 2: - dropped the register readback after the *switch* not inside it, updated the patch description/subject accordingly; - added the reigster name in the patch description/subject. drivers/usb/host/xhci-hub.c | 2 -- 1 file changed, 2 deletions(-) Index: usb/drivers/usb/host/xhci-hub.c =================================================================== --- usb.orig/drivers/usb/host/xhci-hub.c +++ usb/drivers/usb/host/xhci-hub.c @@ -1522,8 +1522,6 @@ int xhci_hub_control(struct usb_hcd *hcd default: goto error; } - /* unblock any posted writes */ - temp = readl(ports[wIndex]->addr); break; case ClearPortFeature: if (!wIndex || wIndex > max_ports)
