linux-kernel - Re: [PATCH 1/1] scsi/ufshcd: Fix NULL pointer dereference for in ufshcd

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Message-ID: <CAFp+6iEpZThehq4896dmYifvbNF5wa3ESyw7yBv7vpUbtQKzhA@mail.gmail.com>
Date:   Wed, 29 Aug 2018 13:50:44 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     evgreen@...omium.org
Cc:     jejb@...ux.vnet.ibm.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Subhash Jadavani <subhashj@...eaurora.org>, mka@...omium.org
Subject: Re: [PATCH 1/1] scsi/ufshcd: Fix NULL pointer dereference for in ufshcd_init

On Wed, Aug 29, 2018 at 1:13 AM Evan Green <evgreen@...omium.org> wrote:
>
> On Tue, Aug 7, 2018 at 10:48 AM Vivek Gautam
> <vivek.gautam@...eaurora.org> wrote:
> >
> > Error paths in ufshcd_init() ufshcd_hba_exit() killed clk_scaling
> > workqueue when the workqueue is actually created quite late in
> > ufshcd_init().
> > So, we end up getting NULL pointer dereference in such error paths.
> > Fix this by moving clk_scaling initialization and kill codes to
> > two separate methods, and call them at required places.
> >
> > Fixes: 401f1e4490ee ("scsi: ufs: don't suspend clock scaling during clock
> > gating")
> >
> > Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Cc: Subhash Jadavani <subhashj@...eaurora.org>
> > Cc: Matthias Kaehlcke <mka@...omium.org>
> > Cc: Evan Green <evgreen@...omium.org>
> > Cc: Martin K. Petersen <martin.petersen@...cle.com>
> > ---
> >
> > Bjorn, Subhash,
> > I am not certain of some of these devfreq, and clk_scaling bits
> > that are moved as part of this patch. Please help in reviewing the
> > change in the light of these features, and related sequence should
> > be followed.
> > Thanks.
> >
>
> You're right, there is a lot of logic moving around here. I think this
> looks okay to me.
>
> Reviewed-by: Evan Green <evgreen@...omium.org>

Thanks Evan.

Best regards
Vivek

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