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SubjectRe: [PATCH 4/6 v2] PM: Limit race conditions between runtime PM and system sleep (v2)
On Wed, Nov 2, 2011 at 9:11 PM, Greg KH <> wrote:
> On Wed, Nov 02, 2011 at 09:06:02PM +0100, Linus Walleij wrote:
>> On Wed, Nov 2, 2011 at 8:14 PM, Greg KH <> wrote:
>> > So, what specific git commits do you want to see in the 3.0-stable
>> > tree, and in what order should they be applied in?
>> So to my untrained eye it looks like it should be applied like this (top to
>> bottom) using the reverse commit order from the mainline kernel:
>> e529192 PM: Introduce generic "noirq" callback routines for subsystems (v2)
>> 455716e PM / Runtime: Update documentation of interactions with system sleep
>> 1e2ef05 PM: Limit race conditions between runtime PM and system sleep (v2)
>> f3393b6 PM / Runtime: Add new helper function: pm_runtime_status_suspended()
>> So (2) documents the problem, (3) fixes it, whereas (1) and (4) makes
>> it possible
>> to write proper _noirq() code that does not race, IIRC.
> But, after this, it's just adding new infrastructure that drivers will
> then be able to use.  As I'm not adding new drivers to 3.0, there will
> not be any users of this code, so why add it in the first place?  It
> doesn't look like this follows the rules of the stable kernel tree at
> all, does it?

We'll have to get some feedback from Rafael, but the way I percieved
it, the patch (2) fixes a very real race, then fixing that makes it
necessary for drivers using runtime_pm to do things differently to
be on the safe side. But none were really fixed when first merging

So on second thought you probably only want patch (2)
"PM: Limit race conditions between runtime PM and system sleep (v2)"
for stable.

Linus Walleij
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