linux-kernel - Re: [PATCH] PM / Hibernate: Thaw processes in SNAPSHOT_CREATE

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Message-ID: <20111201154722.GB12668@google.com>
Date:	Thu, 1 Dec 2011 07:47:22 -0800
From:	Tejun Heo <tj@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	rjw@...k.pl, pavel@....cz, len.brown@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH] PM / Hibernate: Thaw processes in
 SNAPSHOT_CREATE_IMAGE ioctl error/test paths

On Thu, Dec 01, 2011 at 06:45:37PM +0530, Srivatsa S. Bhat wrote:
> Commit 2aede851ddf08666f68ffc17be446420e9d2a056 (PM / Hibernate: Freeze
> kernel threads after preallocating memory) moved the freezing of kernel
> threads to hibernation_snapshot() function.
> 
> So now, if the call to hibernation_snapshot() fails or returns early due
> to a successful hibernation test, the caller has to thaw processes to
> ensure that the system gets back to its original state.
> 
> But in SNAPSHOT_CREATE_IMAGE hibernation ioctl, the caller does not thaw
> processes. Fix this issue. But note that if hibernation_snapshot() returned
> due to a successful freezer test, we still send the value of 'in_suspend'
> (which is now 0) to userspace, because we are not in an error path per-se,
> and moreover, the value of in_suspend correctly depicts the situation here.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Is this still applicable on top of pm-freezer branch?

Thanks.

-- 
tejun
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