Messages in this thread | | | Date | Sun, 25 Apr 2010 11:29:24 -0400 (EDT) | From | Alan Stern <> | Subject | Re: [linux-pm] [PATCH 8/9] Input: Block suspend while event queue is not empty. |
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On Sun, 25 Apr 2010, Rafael J. Wysocki wrote:
> On Saturday 24 April 2010, Alan Stern wrote: > > On Fri, 23 Apr 2010, Arve Hjønnevåg wrote: > > > > > On Fri, Apr 23, 2010 at 2:08 PM, Dmitry Torokhov > > > <dmitry.torokhov@gmail.com> wrote: > > > > On Friday 23 April 2010 01:56:25 pm Randy Dunlap wrote: > > > >> On Thu, 22 Apr 2010 18:08:57 -0700 Arve Hjønnevåg wrote: > > > >> > Add an ioctl, EVIOCSSUSPENDBLOCK, to enable a suspend_blocker that will > > > >> > block suspend while the event queue is not empty. This allows userspace > > > >> > code to process input events while the device appears to be asleep.
> > Is there some reason why this feature needs to be enabled by an > > ioctl? Why not make this suspend blocker permanently enabled? > > The ioctl is there so that user space can use suspend blockers, which is > needed because only user space know that some activities are going to continue > and therefore the system should not be suspended (like playing music "in the > background").
No, you're thinking of a different ioctl: SUSPEND_BLOCKER_IOCTL_BLOCK. This one (EVIOCSSUSPENDBLOCK) is present _only_ to enable one specific suspend blocker, which is activated when the input event queue is non-empty. I don't see any reason why it shouldn't be enabled all the time.
Alan Stern
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