Re: [PATCH] cpufreq, store_scaling_governor requires policy->rwsem to be held for duration of changing governors [v2]

From: Saravana Kannan
Date: Wed Jul 30 2014 - 21:36:10 EST

On 07/30/2014 02:40 PM, Rafael J. Wysocki wrote:
On Wednesday, July 30, 2014 10:18:25 AM Prarit Bhargava wrote:

On 07/29/2014 08:03 PM, Rafael J. Wysocki wrote:
On Tuesday, July 29, 2014 07:46:02 AM Prarit Bhargava wrote:


This patch effectively reverts commit 955ef483.

The issue reported in this patch is valid. We are seeing that internally too. I believe I reported it in another thread (within the past month).

However, the original patch fixes a real deadlock issue (I'm too tired to look it up now). We can revet the original, but it's going to bring back the original issue. I just want to make sure Prarit and Raphael realize this before proceeding.

I do have plans for a proper fix for the mainline (not stable branches), but plan to do that after the current set of suspend/hotplug patches go through. The fix would be easier to make after that.

OK, I'm convinced by this.

I suppose we should push it for -stable from 3.10 through 3.15.x, right?

Rafael, I think that is a good idea. I'm not sure what the protocol is for
adding stable@xxxxxxxxxx though ...

I'll take care of this, thanks!

But you aren't going to pull the in for the next release, right?


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