linux-kernel - Re: [PATCH 1/2] staging: media: atomisp: return early on hmm_bo_device

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Message-ID: <8372cba0-61da-468d-97b2-85deb8bd4129@suswa.mountain>
Date: Mon, 14 Jul 2025 22:13:55 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Abdelrahman Fekry <abdelrahmanfekry375@...il.com>
Cc: Hans de Goede <hansg@...nel.org>, mchehab@...nel.org,
	sakari.ailus@...ux.intel.org, andy@...nel.org,
	gregkh@...uxfoundation.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
	linux-kernel-mentees@...ts.linux.dev, skhan@...uxfoundation.org
Subject: Re: [PATCH 1/2] staging: media: atomisp: return early on
 hmm_bo_device_init() failure

On Mon, Jul 07, 2025 at 05:15:20PM +0300, Abdelrahman Fekry wrote:
> Hi Hans.
> On Mon, Jul 7, 2025 at 5:12 PM Hans de Goede <hansg@...nel.org> wrote:
> >
> > Hi Abdelrahman,
> >
> > On 7-Jul-25 16:09, Abdelrahman Fekry wrote:
> > > hmm_init() would continue execution even if hmm_bo_device_init() failed,
> > > potentially leading to bad behaviour when calling hmm_alloc().
> > >
> > > - returns the error immediately if hmm_bo_device_init() fails.
> > >
> > > Signed-off-by: Abdelrahman Fekry <abdelrahmanfekry375@...il.com>
> > > ---
> > >  drivers/staging/media/atomisp/pci/hmm/hmm.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/staging/media/atomisp/pci/hmm/hmm.c b/drivers/staging/media/atomisp/pci/hmm/hmm.c
> > > index f998b57f90c4..c2ee9d2ec0d5 100644
> > > --- a/drivers/staging/media/atomisp/pci/hmm/hmm.c
> > > +++ b/drivers/staging/media/atomisp/pci/hmm/hmm.c
> > > @@ -36,6 +36,7 @@ int hmm_init(void)
> > >                                ISP_VM_START, ISP_VM_SIZE);
> > >       if (ret)
> > >               dev_err(atomisp_dev, "hmm_bo_device_init failed.\n");
> > > +             return ret;
> >
> > You need to add { } here otherwise the "return ret;" will
> > always get executed since it is not part of the code block
> > guarded by the if (despite the indentation).
> >
> Yes , sorry for this dumb mistake. I will send v2.
> 

Smatch has a check for this.

~/smatch/smatch_scripts/kchecker drivers/staging/media/atomisp/pci/hmm/hmm.c

regards,
dan carpenter