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| author | Alan Stern <stern@rowland.harvard.edu> | 2011-11-04 03:52:46 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-11-05 01:28:14 +0400 |
| commit | b2c0a863e14676fa5760c6d828fd373288e2f64a (patch) | |
| tree | de1248abbc2a45e9798fceb2e9df57bf7440c6d9 /drivers | |
| parent | 886486b792e4f6f96d4fbe8ec5bf20811cab7d6a (diff) | |
| download | linux-b2c0a863e14676fa5760c6d828fd373288e2f64a.tar.xz | |
USB: Update last_busy time after autosuspend fails
Originally, the runtime PM core would send an idle notification
whenever a suspend attempt failed. The idle callback routine could
then schedule a delayed suspend for some time later.
However this behavior was changed by commit
f71648d73c1650b8b4aceb3856bebbde6daa3b86 (PM / Runtime: Remove idle
notification after failing suspend). No notifications were sent, and
there was no clear mechanism to retry failed suspends.
This caused problems for the usbhid driver, because it fails
autosuspend attempts as long as a key is being held down. A companion
patch changes the PM core's behavior, but we also need to change the
USB core. In particular, this patch (as1493) updates the device's
last_busy time when an autosuspend fails, so that the PM core will
retry the autosuspend in the future when the delay time expires
again.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Henrik Rydberg <rydberg@euromail.se>
Cc: <stable@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/core/driver.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 3b029a0a4787..c2c0ae57e7ff 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1667,6 +1667,11 @@ int usb_runtime_suspend(struct device *dev) return -EAGAIN; status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); + + /* Allow a retry if autosuspend failed temporarily */ + if (status == -EAGAIN || status == -EBUSY) + usb_mark_last_busy(udev); + /* The PM core reacts badly unless the return code is 0, * -EAGAIN, or -EBUSY, so always return -EBUSY on an error. */ |