Re: [PATCH] InfiniBand: Deletion of unnecessary checks before two function calls

From	SF Markus Elfring <elfring@users.sourceforge.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH] InfiniBand: Deletion of unnecessary checks before two function calls
Date	2015-07-01 11:00 +0200
Message-ID	<pHm26-2Wc-9@gated-at.bofh.it> (permalink)
References	(13 earlier) <mSsDN-4wa-61@gated-at.bofh.it> <mSsDN-4wa-63@gated-at.bofh.it> <mSsDN-4wa-65@gated-at.bofh.it> <mSsDN-4wa-33@gated-at.bofh.it> <ooiaS-85H-29@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Wed, 19 Nov 2014 19:19:21 +0100
> 
> The functions kfree() and pci_dev_put() test whether their argument is NULL
> and then return immediately. Thus the test around the call is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/infiniband/hw/mlx4/main.c         | 3 +--
>  drivers/infiniband/hw/mthca/mthca_reset.c | 3 +--
>  2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
> index 8b72cf3..50dee1a 100644
> --- a/drivers/infiniband/hw/mlx4/main.c
> +++ b/drivers/infiniband/hw/mlx4/main.c
> @@ -2512,8 +2512,7 @@ static void do_slave_init(struct mlx4_ib_dev *ibdev, int slave, int do_init)
>  		if (!dm[i]) {
>  			pr_err("failed to allocate memory for tunneling qp update work struct\n");
>  			for (i = 0; i < dev->caps.num_ports; i++) {
> -				if (dm[i])
> -					kfree(dm[i]);
> +				kfree(dm[i]);
>  			}
>  			goto out;
>  		}
> diff --git a/drivers/infiniband/hw/mthca/mthca_reset.c b/drivers/infiniband/hw/mthca/mthca_reset.c
> index 74c6a94..c521654 100644
> --- a/drivers/infiniband/hw/mthca/mthca_reset.c
> +++ b/drivers/infiniband/hw/mthca/mthca_reset.c
> @@ -279,8 +279,7 @@ good:
>  	}
>  
>  out:
> -	if (bridge)
> -		pci_dev_put(bridge);
> +	pci_dev_put(bridge);
>  	kfree(bridge_header);
>  	kfree(hca_header);
>  
> 

More software developers became interested in similar
source code improvements.

infiniband: Remove redundant NULL check before kfree
https://lkml.org/lkml/2015/6/26/45
https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg919966.html

Regards,
Markus
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Re: [PATCH] InfiniBand: Deletion of unnecessary checks before two  function calls SF Markus Elfring <elfring@users.sourceforge.net> - 2015-07-01 11:00 +0200

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