linux-kernel - Re: [PATCH] dmaengine: bcm-sba-raid: Handle mbox_request

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Date:   Mon, 14 Oct 2019 14:00:31 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
Cc:     Vinod Koul <vinod.koul@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        dmaengine@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <ray.jui@...adcom.com>
Subject: Re: [PATCH] dmaengine: bcm-sba-raid: Handle mbox_request_channel
 failure

Hi Rayagonda,

On 27-09-19, 09:38, Rayagonda Kokatanur wrote:
> Hi Vinod,
> 
> Did you get chance to review this fix?

Please do *not* top post

And on your question, sorry this is not in my queue somehow, please
rebase and repost

> 
> Best regards,
> Rayagonda
> 
> 
> On Thu, Jan 10, 2019 at 11:06 PM Ray Jui <ray.jui@...adcom.com> wrote:
> >
> >
> >
> > On 1/9/2019 10:07 PM, Rayagonda Kokatanur wrote:
> > > Fix kernel NULL pointer dereference error when mbox_request_channel()
> > > fails to allocate channel.
> > >
> > > Fixes: 4e9f8187aecb ("dmaengine: bcm-sba-raid: Use only single mailbox channel")
> > > Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
> > > ---
> > >  drivers/dma/bcm-sba-raid.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
> > > index 72878ac5c78d..77ae74663a45 100644
> > > --- a/drivers/dma/bcm-sba-raid.c
> > > +++ b/drivers/dma/bcm-sba-raid.c
> > > @@ -1690,7 +1690,7 @@ static int sba_probe(struct platform_device *pdev)
> > >       sba->mchan = mbox_request_channel(&sba->client, 0);
> > >       if (IS_ERR(sba->mchan)) {
> > >               ret = PTR_ERR(sba->mchan);
> > > -             goto fail_free_mchan;
> > > +             goto fail_exit;
> > >       }
> > >
> > >       /* Find-out underlying mailbox device */
> > > @@ -1747,6 +1747,7 @@ static int sba_probe(struct platform_device *pdev)
> > >       sba_freeup_channel_resources(sba);
> > >  fail_free_mchan:
> > >       mbox_free_channel(sba->mchan);
> > > +fail_exit:
> > >       return ret;
> > >  }
> > >
> > >
> >
> > Looks good to me.
> >
> > Reviewed-by: Ray Jui <ray.jui@...adcom.com>

-- 
~Vinod