linux-kernel - Re: [tip:smp/hotplug] cpufreq: Fix up conversion to hotplug state machine

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Message-ID: <20160920160855.mut42gsbm5m5y2o5@pd.tnic>
Date:   Tue, 20 Sep 2016 18:08:55 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     bigeasy@...utronix.de, tglx@...utronix.de, hpa@...or.com,
        mingo@...nel.org, linux-kernel@...r.kernel.org
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:smp/hotplug] cpufreq: Fix up conversion to hotplug state
 machine

On Tue, Sep 20, 2016 at 08:07:08AM -0700, tip-bot for Sebastian Andrzej Siewior wrote:
> Commit-ID:  5372e054a1928fe704cf0a5e2e139645a777b50a
> Gitweb:     http://git.kernel.org/tip/5372e054a1928fe704cf0a5e2e139645a777b50a
> Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> AuthorDate: Tue, 20 Sep 2016 16:56:28 +0200
> Committer:  Thomas Gleixner <tglx@...utronix.de>
> CommitDate: Tue, 20 Sep 2016 16:59:21 +0200
> 
> cpufreq: Fix up conversion to hotplug state machine
> 
> The function cpufreq_register_driver() returns zero on success and since
> commit 27622b061eb4 ("cpufreq: Convert to hotplug state machine")
> erroneously a positive number. Due to the "if (x) assume_error" construct
> all callers assumed an error and as a consequence the cpu freq kworker
> crashes with a NULL pointer dereference.
> 
> Reset the return value back to zero in the success case.
> 
> Fixes: 27622b061eb4 ("cpufreq: Convert to hotplug state machine")
> Reported-by: Borislav Petkov <bp@...en8.de>

	-and-tested-by: me.

Thanks!

-- 
Regards/Gruss,
    Boris.

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