linux-kernel - Re: [PATCH] [media] netup_unidvb: Remove a useless memset

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Date:	Sat, 09 Jan 2016 23:29:41 -0800
From:	Joe Perches <joe@...ches.com>
To:	Christophe JAILLET <christophe.jaillet@...adoo.fr>, serjk@...up.ru,
	mchehab@....samsung.com
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] [media] netup_unidvb: Remove a useless memset

On Sun, 2016-01-10 at 08:20 +0100, Christophe JAILLET wrote:
> This memory is allocated using kzalloc so there is no need to call
> memset(..., 0, ...)
[]
> diff --git a/drivers/media/pci/netup_unidvb/netup_unidvb_core.c b/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
[]
> @@ -774,7 +774,6 @@ static int netup_unidvb_initdev(struct pci_dev *pci_dev,
>  
>  	if (!ndev)
>  		goto dev_alloc_err;
> -	memset(ndev, 0, sizeof(*ndev));
>  	ndev->old_fw = old_firmware;
>  	ndev->wq = create_singlethread_workqueue(NETUP_UNIDVB_NAME);
>  	if (!ndev->wq) {

It's unusual to not see the alloc above the if

Perhaps it'd be more standard to do something like:
---
diff --git a/drivers/media/pci/netup_unidvb/netup_unidvb_core.c b/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
index 525ebfe..c94cecd 100644
--- a/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
+++ b/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
@@ -771,10 +771,9 @@ static int netup_unidvb_initdev(struct pci_dev *pci_dev,
 
 	/* allocate device context */
 	ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
-
 	if (!ndev)
 		goto dev_alloc_err;
-	memset(ndev, 0, sizeof(*ndev));
+
 	ndev->old_fw = old_firmware;
 	ndev->wq = create_singlethread_workqueue(NETUP_UNIDVB_NAME);
 	if (!ndev->wq) {