linux-kernel - Re: [PATCH 2/3] SCSI-debug: Less function calls in scsi_debug

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Date:	Mon, 23 Feb 2015 13:14:34 -0500
From:	Douglas Gilbert <dgilbert@...erlog.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	"James E. J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 2/3] SCSI-debug: Less function calls in scsi_debug_init()
 after error detection

On 15-02-06 12:25 PM, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Fri, 6 Feb 2015 17:48:34 +0100
>
> The vfree() function was called in two cases by the scsi_debug_init() function
> during error handling even if the passed variables "dif_storep" and
> "map_storep" contained null pointers eventually.
>
> This implementation detail could be improved by the introduction of two
> jump labels.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Acked-by: Douglas Gilbert <dgilbert@...erlog.com>

> ---
>   drivers/scsi/scsi_debug.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
> index 9e4add7..756b7be 100644
> --- a/drivers/scsi/scsi_debug.c
> +++ b/drivers/scsi/scsi_debug.c
> @@ -4887,7 +4887,7 @@ static int __init scsi_debug_init(void)
>   		if (dif_storep == NULL) {
>   			pr_err("%s: out of mem. (DIX)\n", __func__);
>   			ret = -ENOMEM;
> -			goto free_vm;
> +			goto free_fake;
>   		}
>
>   		memset(dif_storep, 0xff, dif_size);
> @@ -4920,7 +4920,7 @@ static int __init scsi_debug_init(void)
>   		if (map_storep == NULL) {
>   			pr_err("%s: out of mem. (MAP)\n", __func__);
>   			ret = -ENOMEM;
> -			goto free_vm;
> +			goto free_dif;
>   		}
>
>   		bitmap_zero(map_storep, map_size);
> @@ -4934,7 +4934,7 @@ static int __init scsi_debug_init(void)
>   	if (IS_ERR(pseudo_primary)) {
>   		pr_warn("%s: root_device_register() error\n", __func__);
>   		ret = PTR_ERR(pseudo_primary);
> -		goto free_vm;
> +		goto free_map;
>   	}
>   	ret = bus_register(&pseudo_lld_bus);
>   	if (ret < 0) {
> @@ -4968,9 +4968,11 @@ bus_unreg:
>   	bus_unregister(&pseudo_lld_bus);
>   dev_unreg:
>   	root_device_unregister(pseudo_primary);
> -free_vm:
> +free_map:
>   	vfree(map_storep);
> +free_dif:
>   	vfree(dif_storep);
> +free_fake:
>   	vfree(fake_storep);
>   	return ret;
>   }
>

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