On Tuesday 15 December 2009, Alan Stern wrote:
> This patch (as1317) fixes a bug in the PM core. When a device is
> resumed following a system sleep, the core decrements the device's
> runtime PM usage counter but doesn't issue an idle notification if the
> counter reaches 0. This could prevent an otherwise unused device from
> being runtime-suspended again after the system sleep.
>
> The fix is to call pm_runtime_put_sync() instead of
> pm_runtime_put_noidle().
>
> Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Applied to suspend-2.6/linux-next, will be pushed to Linus before -rc2.
Rafael
> ---
>
> Index: usb-2.6/drivers/base/power/main.c
> ===================================================================
> --- usb-2.6.orig/drivers/base/power/main.c
> +++ usb-2.6/drivers/base/power/main.c
> @@ -521,7 +521,7 @@ static void dpm_complete(pm_message_t st
> mutex_unlock(&dpm_list_mtx);
>
> device_complete(dev, state);
> - pm_runtime_put_noidle(dev);
> + pm_runtime_put_sync(dev);
>
> mutex_lock(&dpm_list_mtx);
> }
> @@ -772,7 +772,7 @@ static int dpm_prepare(pm_message_t stat
> pm_runtime_get_noresume(dev);
> if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
> /* Wake-up requested during system sleep transition. */
> - pm_runtime_put_noidle(dev);
> + pm_runtime_put_sync(dev);
> error = -EBUSY;
> } else {
> error = device_prepare(dev, state);
_______________________________________________
linux-pm mailing list
linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/linux-pm
