linux-kernel - Re: [PATCH] input: ims-pcu: remove redundant assignment to variable 'error'

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Message-ID: <c4290ddf-8faa-bb09-bd96-4c01a3f1cc2b@canonical.com>
Date:   Wed, 3 Jun 2020 15:18:46 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: ims-pcu: remove redundant assignment to variable
 'error'

On 03/06/2020 15:09, Dan Carpenter wrote:
> On Wed, Jun 03, 2020 at 02:51:02PM +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The variable error is being initialized with a value that is
>> never read and the -ENOMEM error return is being returned anyhow
>> by the error exit path to label err_free_mem.  The assignment is
>> redundant and can be removed.
>>
>> Addresses-Coverity: ("Unused value")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/input/misc/ims-pcu.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
>> index d8dbfc030d0f..4ba68aa3d281 100644
>> --- a/drivers/input/misc/ims-pcu.c
>> +++ b/drivers/input/misc/ims-pcu.c
>> @@ -292,7 +292,6 @@ static int ims_pcu_setup_gamepad(struct ims_pcu *pcu)
>>  	if (!gamepad || !input) {
>>  		dev_err(pcu->dev,
>>  			"Not enough memory for gamepad device\n");
>> -		error = -ENOMEM;
>>  		goto err_free_mem;
> 
> It would be better to change the return instead.
> 
> regards,
> dan carpenter
> 

I'm not sure about that, the err_free_mem path is used by another error
exit return path that also needs to free the device and gamepad and
returns ENOMEM, so I think this is a good enough shared error exit strategy.

Colin