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SubjectRe: [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@gmail.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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>

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