linux-kernel - Re: [PATCH] drm/msm/dp: fix error check return value of irq_of_parse_and

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Message-ID: <0e6028f6-3fc1-2a27-0a45-0e024c632248@linaro.org>
Date:   Sat, 23 Apr 2022 01:40:27 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>, cgel.zte@...il.com,
        quic_abhinavk@...cinc.com, robdclark@...il.com, sean@...rly.run
Cc:     airlied@...ux.ie, daniel@...ll.ch, quic_khsieh@...cinc.com,
        bjorn.andersson@...aro.org, linux@...ck-us.net,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Lv Ruyi <lv.ruyi@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] drm/msm/dp: fix error check return value of
 irq_of_parse_and_map()

On 22/04/2022 21:39, Stephen Boyd wrote:
> Quoting cgel.zte@...il.com (2022-04-22 01:49:51)
>> From: Lv Ruyi <lv.ruyi@....com.cn>
>>
>> The irq_of_parse_and_map() function returns 0 on failure, and does not
>> return an negative value.
>>
>> Fixes:  8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
>> Reported-by: Zeal Robot <zealci@....com.cn>
>> Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
>> ---
>>   drivers/gpu/drm/msm/dp/dp_display.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
>> index a42732b67349..3926d2ac107d 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>> @@ -1239,7 +1239,7 @@ int dp_display_request_irq(struct msm_dp *dp_display)
>>          dp = container_of(dp_display, struct dp_display_private, dp_display);
>>
>>          dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
> 
> Why can't platform_get_irq() be used?
> 
>> -       if (dp->irq < 0) {
>> +       if (!dp->irq) {
>>                  rc = dp->irq;
> 
> zero as an error return value is an error?

Hmm, nice catch. Please fix it. And the other patch too.

> 
>>                  DRM_ERROR("failed to get irq: %d\n", rc);
>>                  return rc;


-- 
With best wishes
Dmitry