Re: [PATCH 5/9] i2c: qcom-cci: Use dev_err_probe in probe function

Harshit Mogalapalli
2023-08-21T20:39:25Z

Hi,

On 18/08/23 4:36 pm, Dmitry Baryshkov wrote:
> On 28/07/2023 04:31, Liao Chang wrote:
>> Use the dev_err_probe function instead of dev_err in the probe function
>> so that the printed messge includes the return value and also handles
>> -EPROBE_DEFER nicely.
>>
>> Signed-off-by: Liao Chang <liaochang1@huawei.com>
>> ---
>>   drivers/i2c/busses/i2c-qcom-cci.c | 6 ++----
>>   1 file changed, 2 insertions(+), 4 deletions(-)
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>
>>
>> diff --git a/drivers/i2c/busses/i2c-qcom-cci.c
>> b/drivers/i2c/busses/i2c-qcom-cci.c
>> index 622dc14add9d..cf13abec05f1 100644
>> --- a/drivers/i2c/busses/i2c-qcom-cci.c
>> +++ b/drivers/i2c/busses/i2c-qcom-cci.c
>> @@ -588,10 +588,8 @@ static int cci_probe(struct platform_device *pdev)
>>       /* Clocks */
>>       ret = devm_clk_bulk_get_all(dev, &cci->clocks);
>> -    if (ret < 1) {
>> -        dev_err(dev, "failed to get clocks %d\n", ret);
>> -        return ret;
>> -    }
>> +    if (ret < 1)
>> +        return dev_err_probe(dev, ret, "failed to get clocks\n");

Description:
-----------
* devm_clk_bulk_get_all - managed get multiple clk consumers
* @dev: device for clock "consumer"
* @clks: pointer to the clk_bulk_data table of consumer
*
* Returns a positive value for the number of clocks obtained while the
* clock references are stored in the clk_bulk_data table in @clks field.
* Returns 0 if there're none and a negative value if something failed.
-----------

When ret = 0;

"zero" is passed to dev_err_probe and we are returning success(zero)
from probe function.

Based on other instances of devm_clk_bulk_get_all() API, can we fix it
by changing condition like this?

diff --git a/drivers/i2c/busses/i2c-qcom-cci.c
b/drivers/i2c/busses/i2c-qcom-cci.c
index cf13abec05f1..cea6f70d2b8d 100644
--- a/drivers/i2c/busses/i2c-qcom-cci.c
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -588,7 +588,7 @@ static int cci_probe(struct platform_device *pdev)
/* Clocks */

ret = devm_clk_bulk_get_all(dev, &cci->clocks);
- if (ret < 1)
+ if (ret < 0)
return dev_err_probe(dev, ret, "failed to get clocks\n");
cci->nclocks = ret;

Thanks,
Harshit

>>       cci->nclocks = ret;
>>       /* Retrieve CCI clock rate */
>