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SubjectRe: [PATCH] [media] ov5645: Move an error code assignment in ov5645_probe()
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Hi,

On 15.03.2018 00:17, Sakari Ailus wrote:
> On Wed, Mar 14, 2018 at 10:15:43PM +0100, SF Markus Elfring wrote:
>> From: Markus Elfring <elfring@users.sourceforge.net>
>> Date: Wed, 14 Mar 2018 22:02:52 +0100
>>
>> Move an assignment for a specific error code so that it is stored only once
>> in this function implementation.
>>
>> This issue was detected by using the Coccinelle software.
>
> How?
>
>>
>> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
>> ---
>> drivers/media/i2c/ov5645.c | 6 +-----
>> 1 file changed, 1 insertion(+), 5 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
>> index d28845f7356f..374576380fd4 100644
>> --- a/drivers/media/i2c/ov5645.c
>> +++ b/drivers/media/i2c/ov5645.c
>> @@ -1284,13 +1284,11 @@ static int ov5645_probe(struct i2c_client *client,
>> ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_HIGH, &chip_id_high);
>> if (ret < 0 || chip_id_high != OV5645_CHIP_ID_HIGH_BYTE) {
>> dev_err(dev, "could not read ID high\n");
>> - ret = -ENODEV;
>> goto power_down;
>> }
>> ret = ov5645_read_reg(ov5645, OV5645_CHIP_ID_LOW, &chip_id_low);
>> if (ret < 0 || chip_id_low != OV5645_CHIP_ID_LOW_BYTE) {
>> dev_err(dev, "could not read ID low\n");
>> - ret = -ENODEV;
>> goto power_down;
>> }
>>
>> @@ -1300,7 +1298,6 @@ static int ov5645_probe(struct i2c_client *client,
>> &ov5645->aec_pk_manual);
>> if (ret < 0) {
>> dev_err(dev, "could not read AEC/AGC mode\n");
>> - ret = -ENODEV;
>> goto power_down;
>> }
>>
>> @@ -1308,7 +1305,6 @@ static int ov5645_probe(struct i2c_client *client,
>> &ov5645->timing_tc_reg20);
>> if (ret < 0) {
>> dev_err(dev, "could not read vflip value\n");
>> - ret = -ENODEV;
>> goto power_down;
>> }
>>
>> @@ -1316,7 +1312,6 @@ static int ov5645_probe(struct i2c_client *client,
>> &ov5645->timing_tc_reg21);
>> if (ret < 0) {
>> dev_err(dev, "could not read hflip value\n");
>> - ret = -ENODEV;
>> goto power_down;
>> }
>>
>> @@ -1334,6 +1329,7 @@ static int ov5645_probe(struct i2c_client *client,
>>
>> power_down:
>> ov5645_s_power(&ov5645->sd, false);
>> + ret = -ENODEV;
>
> I don't think this is where people would expect you to set the error code
> in general. It should rather take place before goto, not after it. That'd
> mean another variable, and I'm not convinced the result would improve the
> driver.

I agree with Sakari.

>
>> free_entity:
>> media_entity_cleanup(&ov5645->sd.entity);
>> free_ctrl:
>

--
Best regards,
Todor Tomov

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