linux-kernel - Re: [PATCH][next] media: i2c: ds90ub960: Fix missing return check on ub960_rxport

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Message-ID: <Zv6Z6P0cjYCkyJh9@kekkonen.localdomain>
Date: Thu, 3 Oct 2024 13:19:36 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Colin Ian King <colin.i.king@...il.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] media: i2c: ds90ub960: Fix missing return check on
 ub960_rxport_read call

Moi,

On Thu, Oct 03, 2024 at 03:52:17PM +0300, Tomi Valkeinen wrote:
> Hi,
> 
> On 03/10/2024 09:05, Sakari Ailus wrote:
> > Hi Colin,
> > 
> > On Wed, Oct 02, 2024 at 05:53:29PM +0100, Colin Ian King wrote:
> > > The function ub960_rxport_read is being called and afterwards ret is
> > > being checked for any failures, however ret is not being assigned to
> > > the return of the function call. Fix this by assigning ret to the
> > > return of the call which appears to be missing.
> > > 
> > > Fixes: afe267f2d368 ("media: i2c: add DS90UB960 driver")
> > > Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> > > ---
> > >   drivers/media/i2c/ds90ub960.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/media/i2c/ds90ub960.c b/drivers/media/i2c/ds90ub960.c
> > > index ffe5f25f8647..58424d8f72af 100644
> > > --- a/drivers/media/i2c/ds90ub960.c
> > > +++ b/drivers/media/i2c/ds90ub960.c
> > > @@ -1286,7 +1286,7 @@ static int ub960_rxport_get_strobe_pos(struct ub960_data *priv,
> > >   	clk_delay += v & UB960_IR_RX_ANA_STROBE_SET_CLK_DELAY_MASK;
> > > -	ub960_rxport_read(priv, nport, UB960_RR_SFILTER_STS_1, &v);
> > > +	ret = ub960_rxport_read(priv, nport, UB960_RR_SFILTER_STS_1, &v);
> > >   	if (ret)
> > >   		return ret;
> > 
> > There seems to be a similar issues all around the driver. It'd be good to
> > fix them at the same time.
> 
> With similar issues, do you mean the code not checking the return value at
> all for i2c reads and writes?
> 
> In this particular case the code already checks the return value, but
> setting the return value was missing. With a quick browse, I didn't see
> other like this.

See e.g. ub960_clear_rx_errors(), ub960_log_status(),
ub960_rxport_set_strobe_pos() and ub960_rxport_set_strobe_range.

-- 
Terveisin,

Sakari Ailus