linux-kernel - Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: Clean up tests if NULL returned on failure

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Date:   Thu, 26 Mar 2020 08:23:34 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Simran Singhal <singhalsimran0@...il.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel <outreachy-kernel@...glegroups.com>
Subject: Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: Clean up tests
 if NULL returned on failure



On Thu, 26 Mar 2020, Simran Singhal wrote:

> Some functions like kmalloc/kzalloc return NULL on failure.
> When NULL represents failure, !x is commonly used.

Try for a shorter subject line.  "Simplify NULL tests" would do.  Then the
log message should be in the imperative.

julia


>
> This was done using Coccinelle:
> @@
> expression *e;
> identifier l1;
> @@
>
> e = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\)(...);
> ...
> - e == NULL
> + !e
>
> Signed-off-by: Simran Singhal <singhalsimran0@...il.com>
> ---
>  drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> index 29f36cca3972..5c27c11f006a 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> @@ -474,7 +474,7 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param,
>  			wep_key_len = wep_key_len <= 5 ? 5 : 13;
>  			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, KeyMaterial);
>  			pwep = kzalloc(wep_total_len, GFP_KERNEL);
> -			if (pwep == NULL) {
> +			if (!pwep) {
>  				RT_TRACE(_module_rtl871x_ioctl_os_c, _drv_err_, (" wpa_set_encryption: pwep allocate fail !!!\n"));
>  				goto exit;
>  			}
> @@ -2137,7 +2137,7 @@ static int rtw_wx_set_enc_ext(struct net_device *dev,
>
>  	param_len = sizeof(struct ieee_param) + pext->key_len;
>  	param = kzalloc(param_len, GFP_KERNEL);
> -	if (param == NULL)
> +	if (!param)
>  		return -1;
>
>  	param->cmd = IEEE_CMD_SET_ENCRYPTION;
> @@ -3491,7 +3491,7 @@ static int rtw_set_encryption(struct net_device *dev, struct ieee_param *param,
>  			wep_key_len = wep_key_len <= 5 ? 5 : 13;
>  			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, KeyMaterial);
>  			pwep = kzalloc(wep_total_len, GFP_KERNEL);
> -			if (pwep == NULL) {
> +			if (!pwep) {
>  				DBG_871X(" r871x_set_encryption: pwep allocate fail !!!\n");
>  				goto exit;
>  			}
> --
> 2.17.1
>
> --
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>