linux-kernel - Re: [PATCH] mtd: nand: nandsim: fix error check

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Message-ID: <582DE75D.5040503@gmail.com>
Date:   Thu, 17 Nov 2016 17:22:37 +0000
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Marek Vasut <marek.vasut@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
CC:     linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH] mtd: nand: nandsim: fix error check

On Thursday 17 November 2016 01:21 PM, Marek Vasut wrote:
> On 11/16/2016 09:56 PM, Sudip Mukherjee wrote:
>> On Wednesday 16 November 2016 04:56 PM, Marek Vasut wrote:
>>> On 11/16/2016 08:52 AM, Sudip Mukherjee wrote:
>>>> On Tuesday 15 November 2016 11:42 PM, Marek Vasut wrote:
>>>>> On 11/16/2016 12:09 AM, Sudip Mukherjee wrote:
>>>>>> debugfs_create_dir() and debugfs_create_file() returns NULL on
>>>>>> error or
>>>>>> a pointer on success. They do not return the error value with ERR_PTR.
>>>>>> So we should not check the return with IS_ERR_OR_NULL, instead we
>>>>>> should just check for NULL.
>>>>>>
>>>>>> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
>>>>>> ---
>>>>>>     drivers/mtd/nand/nandsim.c | 9 +++------
>>>>>>     1 file changed, 3 insertions(+), 6 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
>>>>>> index c76287a..9b0d79a 100644
>>>>>> --- a/drivers/mtd/nand/nandsim.c
>>>>>> +++ b/drivers/mtd/nand/nandsim.c
>>>>>> @@ -525,15 +525,13 @@ static int nandsim_debugfs_create(struct
>>>>>> nandsim *dev)
>>>>>>     {
>>>>>>         struct nandsim_debug_info *dbg = &dev->dbg;
>>>>>>         struct dentry *dent;
>>>>>> -    int err;
>>>>>> +    int err = -ENODEV;
>>>>>
>>>>> Why don't you just nuke the err altogether and just return -ENODEV ?
>>>>
>>>> That was the first version which i made and discarded before sending. I
>>>> will go and find it now.
>>>
>>> Why did you discard it ?
>>>
>>
>> That is actually a stupid reason. I was confused with the print
>> statement which uses err.
>>
>> NS_ERR("cannot create \"nandsim\" debugfs directory, err %d\n",
>>              err);
>>
>
> Ah, got it, so yeah, nuke the err altogether :)

v2 is already sent yesterday.

Regards
Sudip