linux-kernel - Re: [Outreachy kernel] [PATCH] Staging: irda: Use !x instead of NULL comparison

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Message-ID: <alpine.DEB.2.20.1709160912540.2943@hadrien>
Date:   Sat, 16 Sep 2017 09:14:21 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Srishti Sharma <srishtishar@...il.com>
cc:     samuel@...tiz.org, gregkh@...uxfoundation.org,
        netdev@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] Staging: irda: Use !x instead of NULL
 comparison



On Sat, 16 Sep 2017, Srishti Sharma wrote:

> Test for NULL as !x where functions that return NULL on failure
> are used. Done using the following semantic patch by coccinelle.
>
> @ is_null @
> expression E;
> statement S;
> @@
>
> E = (\(kmalloc\|devm_kzalloc\|kmalloc_array\|devm_ioremap\|
> usb_alloc_urb\|alloc_netdev\|dev_alloc_skb\)(...));
>
> (
> if(!E)
>    S
> |
> -if(E==NULL)
> +if(!E)
>     S
> )
>
> Signed-off-by: Srishti Sharma <srishtishar@...il.com>

Acked-by: Julia Lawall <julia.lawall@...6.fr>


> ---
>  drivers/staging/irda/net/discovery.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/irda/net/discovery.c b/drivers/staging/irda/net/discovery.c
> index 364d70a..1e54954 100644
> --- a/drivers/staging/irda/net/discovery.c
> +++ b/drivers/staging/irda/net/discovery.c
> @@ -179,7 +179,7 @@ void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force)
>  				/* Create the client specific buffer */
>  				n = HASHBIN_GET_SIZE(log);
>  				buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
> -				if (buffer == NULL) {
> +				if (!buffer) {
>  					spin_unlock_irqrestore(&log->hb_spinlock, flags);
>  					return;
>  				}
> @@ -291,7 +291,7 @@ struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn,
>  				/* Create the client specific buffer */
>  				n = HASHBIN_GET_SIZE(log);
>  				buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
> -				if (buffer == NULL) {
> +				if (!buffer) {
>  					spin_unlock_irqrestore(&log->hb_spinlock, flags);
>  					return NULL;
>  				}
> --
> 2.7.4
>
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