linux-kernel - Re: [PATCH 5/9] i2c: qcom-cci: Use dev_err

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Date:   Tue, 22 Aug 2023 02:07:57 +0530
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Liao Chang <liaochang1@...wei.com>, andi.shyti@...nel.org,
        florian.fainelli@...adcom.com, rjui@...adcom.com,
        sbranden@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
        yangyicong@...ilicon.com, aisheng.dong@....com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, kblaiech@...dia.com,
        asmaa@...dia.com, loic.poulain@...aro.org, rfoss@...nel.org,
        ardb@...nel.org, gcherian@...vell.com
Cc:     linux-i2c@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/9] i2c: qcom-cci: Use dev_err_probe in probe function

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@...wei.com>
>> ---
>>   drivers/i2c/busses/i2c-qcom-cci.c | 6 ++----
>>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.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 */
>