linux-kernel - Re: [PATCH 2/3] xen-scsiback: One function call less in scsiback_device

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Date:	Tue, 19 Jul 2016 16:56:35 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Jürgen Groß <jgross@...e.com>
Cc:	xen-devel@...ts.xenproject.org, linux-scsi@...r.kernel.org,
	David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 2/3] xen-scsiback: One function call less in
 scsiback_device_action() after error detection

>> @@ -606,7 +606,7 @@ static void scsiback_device_action(struct vscsibk_pend *pending_req,
>>  	tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
>>  	if (!tmr) {
>>  		target_put_sess_cmd(se_cmd);
>> -		goto err;
>> +		goto do_resp;
>>  	}
> 
> Hmm, I'm not convinced this is an improvement.
> 
> I'd rather rename the new error label to "put_cmd" and get rid of the
> braces in above if statement:
> 
> -	if (!tmr) {
> -		target_put_sess_cmd(se_cmd);
> -		goto err;
> -	}
> +	if (!tmr)
> +		goto put_cmd;
> 
> and then in the error path:
> 
> -err:
> +put_cmd:
> +	target_put_sess_cmd(se_cmd);

I am unsure on the relevance of this function on such a source position.
Would it make sense to move it further down at the end?


> +free_tmr:
> 	kfree(tmr);

How do you think about to skip this function call after a memory
allocation failure?

Regards,
Markus