[PATCH resend] ov7670: clean up ov7670_read semantics

From: Andres Salomon
Date: Fri Jul 11 2008 - 16:52:56 EST


[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]


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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andres Salomon <dilinger@xxxxxxxxxx>
Acked-by: Jonathan Corbet <corbet@xxxxxxx>
---
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;

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
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