linux-kernel - Re: [PATCH 1/1] drm/nouveau: fix error return code in nouveau_backlight

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Date:   Sat, 8 May 2021 17:18:13 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        nouveau <nouveau@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] drm/nouveau: fix error return code in
 nouveau_backlight_init()



On 2021/5/8 15:34, Pierre Moreau wrote:
> Hello Zhen,
> 
> There was a similar patch sent in last month, though which does not seem to
> have been merged yet; see
> https://lists.freedesktop.org/archives/nouveau/2021-April/038451.html.
> 
> Whether `ret` should be `-ENOSPC` or `-ENOMEM` is hard to say as
> `nouveau_get_backlight_name()` could fail due to either.
> 
> I will propose an alternative fix which modifies `nouveau_get_backlight_name()`
> to return an int so the actual error code can be propagated back instead of
> guessed, as well as fix an ida ID leak which I just spotted.

It's a good idea.

> 
> Best,
> Pierre
> 
> On 2021-05-08 — 11:48, Zhen Lei wrote:
>> Fix to return a negative error code from the error handling case instead
>> of 0, as done elsewhere in this function.
>>
>> Fixes: db1a0ae21461 ("drm/nouveau/bl: Assign different names to interfaces")
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  drivers/gpu/drm/nouveau/nouveau_backlight.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> index 72f35a2babcb..097ca344a086 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
>> @@ -273,6 +273,7 @@ nouveau_backlight_init(struct drm_connector *connector)
>>  		return -ENOMEM;
>>  
>>  	if (!nouveau_get_backlight_name(backlight_name, bl)) {
>> +		ret = -ENOSPC;
>>  		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
>>  		goto fail_alloc;
>>  	}
>> -- 
>> 2.25.1
>>
>>
> 
> .
>