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| author | Alan Stern <stern@rowland.harvard.edu> | 2013-05-14 13:55:29 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-15 13:41:40 -0400 |
| commit | 997ff893603c6455da4c5e26ba1d0f81adfecdfc (patch) | |
| tree | 58ef65b317b0096a0481863deb4ae80f5b6902fe /drivers/usb | |
| parent | ccd9509a0b942f7a139f1adb741a746ef0220911 (diff) | |
| download | linux-997ff893603c6455da4c5e26ba1d0f81adfecdfc.tar.gz linux-997ff893603c6455da4c5e26ba1d0f81adfecdfc.tar.bz2 linux-997ff893603c6455da4c5e26ba1d0f81adfecdfc.zip | |
USB: UHCI: fix for suspend of virtual HP controller
HP's virtual UHCI host controller takes a long time to suspend
(several hundred microseconds), even when no devices are attached.
This provokes a warning message from uhci-hcd in the auto-stop case.
To prevent this from happening, this patch adds a test to avoid
performing an auto-stop when the wait_for_hp quirk flag is set. The
controller will still suspend through the normal runtime PM mechanism.
And since that pathway includes a 1-ms delay, the slowness of the
virtual hardware won't matter.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: ZhenHua <zhen-hual@hp.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/uhci-hub.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c index f87bee6d2789..9189bc984c98 100644 --- a/drivers/usb/host/uhci-hub.c +++ b/drivers/usb/host/uhci-hub.c @@ -225,7 +225,8 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf) /* auto-stop if nothing connected for 1 second */ if (any_ports_active(uhci)) uhci->rh_state = UHCI_RH_RUNNING; - else if (time_after_eq(jiffies, uhci->auto_stop_time)) + else if (time_after_eq(jiffies, uhci->auto_stop_time) && + !uhci->wait_for_hp) suspend_rh(uhci, UHCI_RH_AUTO_STOPPED); break; |