linux-kernel - Re: USB: serial: Deletion of an unnecessary check before the function call "release

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Date:	Fri, 21 Nov 2014 16:48:39 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Julia Lawall <julia.lawall@...6.fr>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: USB: serial: Deletion of an unnecessary check before the function
 call "release_firmware"

>> diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
>> index ab1d690..3653ec1 100644
>> --- a/drivers/usb/serial/mxuport.c
>> +++ b/drivers/usb/serial/mxuport.c
>> @@ -1101,8 +1101,7 @@ static int mxuport_probe(struct usb_serial *serial,
>>  	 */
>>  	usb_set_serial_data(serial, (void *)id->driver_info);
>>  out:
>> -	if (fw_p)
>> -		release_firmware(fw_p);
>> +	release_firmware(fw_p);
> 
> I think that the if should stay.

I have got an other opinion.


> There were two cases on the allocation, so there should be two cases
> on the release.

I find that this implementation detail does not really matter for the
necessity of a null pointer check directly before such a function call.

Regards,
Markus
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