lkml.org 
[lkml]   [2008]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH resend] ov7670: clean up ov7670_read semantics
On Fri, 11 Jul 2008 16:52:16 -0400 Andres Salomon <dilinger@queued.net> wrote:

> [note: this should probably go in for 2.6.26, as it fixes a bug in
> ov7670_s_fmt where we incorrectly think that we've failed because we
> return !0]
>

In which case 2.6.25.x wants the fix as well?

>
> Cortland Setlow pointed out a bug in ov7670.c where the result from
> ov7670_read() was just being checked for !0, rather than <0. This
> made me realize that ov7670_read's semantics were rather confusing;
> it both fills in 'value' with the result, and returns it. This is
> goes against general kernel convention; so rather than fixing callers,
> let's fix the function.
>
> This makes ov7670_read return <0 in the case of an error, and 0 upon
> success. Thus, code like:
>
> res = ov7670_read(...);
> if (!res)
> goto error;
>
> ..will work properly.
>
> Signed-off-by: Cortland Setlow <csetlow@tower-research.com>
> Signed-off-by: Andres Salomon <dilinger@debian.org>
> Acked-by: Jonathan Corbet <corbet@lwn.net>
> ---
> drivers/media/video/ov7670.c | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
> index 2bc6bdc..d7bfd30 100644
> --- a/drivers/media/video/ov7670.c
> +++ b/drivers/media/video/ov7670.c
> @@ -406,8 +406,10 @@ static int ov7670_read(struct i2c_client *c,
> unsigned char reg, int ret;

You have some wordwrapping happening there.

> ret = i2c_smbus_read_byte_data(c, reg);
> - if (ret >= 0)
> + if (ret >= 0) {
> *value = (unsigned char) ret;
> + ret = 0;
> + }
> return ret;
> }
>
> --
> 1.5.5.3


\
 
 \ /
  Last update: 2008-07-12 00:23    [W:0.087 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site