Re: [PATCH] PM: allow for usage_count > 0 in pm_runtime_get()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, 2 Dec 2009, Rafael J. Wysocki wrote:

> On Tuesday 01 December 2009, Alan Stern wrote:
> > Rafael:
> 
> Hi,
> 
> > One other thing I just noticed.  The power.timer_expires field is 
> > supposed to be nonzero when the timer is scheduled.  But the code at 
> > the end of pm_schedule_suspend() doesn't check for the possibility that 
> > the expiration time might just happen to be 0.  If it is, the 
> > timer_expires value should be bumped up to 1 before the mod_timer() 
> > call.
> 
> Do you mean something like the patch below?
> 
> Rafael
> 
> ---
>  drivers/base/power/runtime.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> Index: linux-2.6/drivers/base/power/runtime.c
> ===================================================================
> --- linux-2.6.orig/drivers/base/power/runtime.c
> +++ linux-2.6/drivers/base/power/runtime.c
> @@ -625,6 +625,8 @@ int pm_schedule_suspend(struct device *d
>  		goto out;
>  
>  	dev->power.timer_expires = jiffies + msecs_to_jiffies(delay);
> +	if (!dev->power.timer_expires)
> +		dev->power.timer_expires = 1;
>  	mod_timer(&dev->power.suspend_timer, dev->power.timer_expires);

Yes, that's exactly what I meant.

Alan Stern

_______________________________________________
linux-pm mailing list
linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/linux-pm

[Index of Archives]     [Linux ACPI]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [CPU Freq]     [Kernel Newbies]     [Fedora Kernel]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux