linux-kernel - Re: [PATCH] [media] stk1160: Check return value of stk1160_read_reg() in stk1160_i2c_read

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Message-ID: <CALF0-+UfoS1MBTeR6ZYNdPwACo+h2PR2E4WfC-aZca4g_Pmpjw@mail.gmail.com>
Date:	Mon, 15 Oct 2012 23:16:54 -0300
From:	Ezequiel Garcia <elezegarcia@...il.com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [media] stk1160: Check return value of stk1160_read_reg()
 in stk1160_i2c_read_reg()

On Mon, Oct 15, 2012 at 9:03 PM, Jesper Juhl <jj@...osbits.net> wrote:
> On Mon, 15 Oct 2012, Ezequiel Garcia wrote:
>
>> On Mon, Oct 15, 2012 at 7:52 PM, Jesper Juhl <jj@...osbits.net> wrote:
>> > On Mon, 15 Oct 2012, Jesper Juhl wrote:
>> >
>> >> On Sat, 13 Oct 2012, Ezequiel Garcia wrote:
>> >>
> [...]
>> > Currently there are two checks for 'rc' being less than zero with no
>> > change to 'rc' between the two, so the second is just dead code.
>> > The intention seems to have been to assign the return value of
>> > 'stk1160_read_reg()' to 'rc' before the (currently dead) second check
>> > and then test /that/. This patch does that.
>> >
>>
>> This is an overly complicated explanation for such a small patch.
>> Can you try to simplify it?
>>
> How's this?
>
>
> From: Jesper Juhl <jj@...osbits.net>
> Date: Sat, 13 Oct 2012 00:16:37 +0200
> Subject: [PATCH] [media] stk1160: Check return value of stk1160_read_reg() in stk1160_i2c_read_reg()
>
> Remember to collect the exit status from 'stk1160_read_reg()' in 'rc'
> before testing it for less than zero.
>
> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> ---
>  drivers/media/usb/stk1160/stk1160-i2c.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/usb/stk1160/stk1160-i2c.c b/drivers/media/usb/stk1160/stk1160-i2c.c
> index 176ac93..a2370e4 100644
> --- a/drivers/media/usb/stk1160/stk1160-i2c.c
> +++ b/drivers/media/usb/stk1160/stk1160-i2c.c
> @@ -116,10 +116,9 @@ static int stk1160_i2c_read_reg(struct stk1160 *dev, u8 addr,
>         if (rc < 0)
>                 return rc;
>
> -       stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
> +       rc = stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
>         if (rc < 0)
>                 return rc;
> -
^^^^^^^^^^^^^^^^^^^^^^^^
Sorry for the nitpick, but I'd like you to *not* remove this line.

Thanks

    Ezequiel
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