From: Alan Stern Date: Fri, 4 May 2007 15:57:00 +0000 (-0400) Subject: OHCI: Fix machine check in ohci_hub_status_data X-Git-Tag: v2.6.22-rc5~60^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6fd75b19483b2f6e6619602a535b4939e46921c1;p=karo-tx-linux.git OHCI: Fix machine check in ohci_hub_status_data This patch (as901) fixes an oversight in ohci-hcd. The hub_status_data routine must not try to access the controller's memory-mapped registers if the controller is in a low-power state; such attempts will cause a crash on some architectures (such as PPC). Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c index 216c9c9d4d6d..bb9cc595219e 100644 --- a/drivers/usb/host/ohci-hub.c +++ b/drivers/usb/host/ohci-hub.c @@ -417,6 +417,8 @@ ohci_hub_status_data (struct usb_hcd *hcd, char *buf) unsigned long flags; spin_lock_irqsave (&ohci->lock, flags); + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) + goto done; /* undocumented erratum seen on at least rev D */ if ((ohci->flags & OHCI_QUIRK_AMD756)