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

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Date:   Wed, 16 Nov 2016 20:56:53 +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 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);


Regards
Sudip