linux-kernel - Re: [PATCH] lvts_thermal.c: Fix error checking for debugfs_create

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Date:   Tue, 30 May 2023 18:15:44 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Osama Muhammad <osmtendev@...il.com>
Cc:     rafael@...nel.org, amitk@...nel.org, rui.zhang@...el.com,
        matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
        bchihi@...libre.com, wenst@...omium.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lvts_thermal.c: Fix error checking for debugfs_create_dir

On 30/05/2023 17:54, Osama Muhammad wrote:
> Hi,
> 
> After Reading more about it I also learned about this and I was
> planning to send a patch to remove the error checking for debugfs
> API.Should I send the patch for it?
> 

Yes, you can change also the prototype of the lvts_debugfs_init() 
function by returning void

And then replace the call site:

         return lvts_debugfs_init(dev, lvts_td);

  by:

	lvts_debugfs_init(dev, lvts_td);

	return 0;

> osmten
> 
> 
> On Tue, 30 May 2023 at 20:47, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>>
>> On 17/05/2023 18:03, Osama Muhammad wrote:
>>> This patch fixes the error checking in lvts_thermal.c in
>>> debugfs_create_dir. The correct way to check if an error occurred
>>> is 'IS_ERR' inline function.
>>
>> We do no longer check debugfs functions return values.
>>
>> eg.
>>
>>    https://www.spinics.net/lists/linux-spi/msg37903.html
>>    https://lore.kernel.org/lkml/2023052835-oxidant-doily-404f@gregkh/
>>
>>
>>> Signed-off-by: Osama Muhammad <osmtendev@...il.com>
>>> ---
>>>    drivers/thermal/mediatek/lvts_thermal.c | 4 ++--
>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
>>> index d0a3f95b7884..61386be78fa0 100644
>>> --- a/drivers/thermal/mediatek/lvts_thermal.c
>>> +++ b/drivers/thermal/mediatek/lvts_thermal.c
>>> @@ -188,7 +188,7 @@ static int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td)
>>>        int i;
>>>
>>>        lvts_td->dom_dentry = debugfs_create_dir(dev_name(dev), NULL);
>>> -     if (!lvts_td->dom_dentry)
>>> +     if (IS_ERR(lvts_td->dom_dentry))
>>>                return 0;
>>>
>>>        for (i = 0; i < lvts_td->num_lvts_ctrl; i++) {
>>> @@ -197,7 +197,7 @@ static int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td)
>>>
>>>                sprintf(name, "controller%d", i);
>>>                dentry = debugfs_create_dir(name, lvts_td->dom_dentry);
>>> -             if (!dentry)
>>> +             if (IS_ERR(dentry))
>>>                        continue;
>>>
>>>                regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
>>
>> --
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