From 1c09b62a4c42d7049e433458859f1c4e61467693 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Tue, 17 Apr 2012 15:24:15 -0400 Subject: [PATCH] EHCI: fix criterion for resuming the root hub commit dc75ce9d929aabeb0843a6b1a4ab320e58ba1597 upstream. This patch (as1542) changes the criterion ehci-hcd uses to tell when it needs to resume the controller's root hub. A resume is needed when a port status change is detected, obviously, but only if the root hub is currently suspended. Right now the driver tests whether the root hub is running, and that is not the correct test. In particular, if the controller has died then the root hub should not be restarted. In addition, some buggy hardware occasionally requires the root hub to be running and sending out SOF packets even while it is nominally supposed to be suspended. In the end, the test needs to be changed. Rather than checking whether the root hub is currently running, the driver will now check whether the root hub is currently suspended. This will yield the correct behavior in all cases. Signed-off-by: Alan Stern CC: Peter Chen Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ben Hutchings --- drivers/usb/host/ehci-hcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 3ff9f82f7263..ffbbf54eca25 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -867,7 +867,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) pcd_status = status; /* resume root hub? */ - if (!(cmd & CMD_RUN)) + if (ehci->rh_state == EHCI_RH_SUSPENDED) usb_hcd_resume_root_hub(hcd); /* get per-port change detect bits */ -- 2.39.2