Re: [PATCH v3 8/9] media: i2c: ov5645: Don't return early on failures for s_stream(0)

[Lad, Prabhakar]

Hi Marco,

Thank you for the review.

On Wed, Oct 26, 2022 at 6:17 PM Marco Felsch <m.felsch@xxxxxxxxxxxxxx> wrote:
>
> Hi Prabhakar,
>
> thanks for the patch, please see below my comments.
>
> On 22-10-26, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> >
> > Make sure we dont stop the code flow in case of errors while stopping
> > the stream and return the error code of the first error case if any.
> >
> > v4l2-core takes care of warning the user so no need to add a warning
> > message in the driver.
> >
> > Suggested-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> > ---
> > v2->v3
> > * Now propagating the first error code in case of failure.
> >
> > v1->v2
> > * New patch
> > ---
> >  drivers/media/i2c/ov5645.c | 11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
> > index eea3067ddc8b..5702a55607fc 100644
> > --- a/drivers/media/i2c/ov5645.c
> > +++ b/drivers/media/i2c/ov5645.c
> > @@ -996,17 +996,22 @@ static int ov5645_s_stream(struct v4l2_subdev *subdev, int enable)
> >               if (ret < 0)
> >                       goto err_rpm_put;
> >       } else {
> > +             int stream_off_ret = 0;
> > +
> >               ret = ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x40);
>
> If this write failed..
>
> >               if (ret < 0)
> > -                     return ret;
> > +                     stream_off_ret = ret;
> >
> >               ret = ov5645_write_reg(ov5645, OV5645_SYSTEM_CTRL0,
> >                                      OV5645_SYSTEM_CTRL0_STOP);
>
> why should this write be successful?
>
Indeed that will fail unless I have a lucky day ;-)

But it seemed to be an overkill for adding an additional check to see
if the previous write succeeded. Do you think this will create an
issue?

Cheers,
Prabhakar