From: Alan Stern Date: Tue, 17 Apr 2012 19:24:15 +0000 (-0400) Subject: EHCI: fix criterion for resuming the root hub X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=dc75ce9d929aabeb0843a6b1a4ab320e58ba1597;p=deliverable%2Flinux.git EHCI: fix criterion for resuming the root hub 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 Cc: stable Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 806cc95317aa..95ca07a8e1b5 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -910,7 +910,7 @@ 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 */