Re: [cocci] [PATCH 57/61] reset: Prefer IS_ERR_OR_NULL over manual NULL check

Masami Hiramatsu (Google) <[email protected]> Wed, 11 Mar 2026 13:59:11 +0900
Newsgroups fr.inria.cocci,dev.linux.lists.dm-devel,dev.linux.lists.gfs2,dev.linux.lists.iommu,dev.linux.lists.ntfs3,dev.linux.lists.sched-ext,dev.linux.lists.v9fs,org.freedesktop.lists.amd-gfx,org.freedesktop.lists.dri-devel,org.freedesktop.lists.intel-gfx,org.infradead.lists.linux-mtd,org.infradead.lists.linux-phy,org.infradead.lists.linux-rockchip,org.kernel.vger.bpf,org.kernel.vger.ceph-devel,org.kernel.vger.kvm,org.kernel.vger.linux-block,org.kernel.vger.linux-bluetooth,org.kernel.vger.linux-btrfs,org.kernel.vger.linux-cifs,org.kernel.vger.linux-clk,org.kernel.vger.linux-ext4,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-gpio,org.kernel.vger.linux-hyperv,org.kernel.vger.linux-input,org.kernel.vger.linux-kernel,org.kernel.vger.linux-leds,org.kernel.vger.linux-media,org.kernel.vger.linux-mips,org.kernel.vger.linux-modules,org.kernel.vger.linux-nfs,org.kernel.vger.linux-omap,org.kernel.vger.linux-pm,org.kernel.vger.linux-s390,org.kernel.vger.linux-scsi,org.kernel.vger.linux-sctp,org.kernel.vger.linux-security-module,org.kernel.vger.linux-sh,org.kernel.vger.linux-sound,org.kernel.vger.linux-trace-kernel,org.kernel.vger.linux-usb,org.kernel.vger.linux-wireless,org.kernel.vger.netdev,org.kernel.vger.target-devel,org.kvack.linux-mm,org.osuosl.intel-wired-lan,org.ozlabs.lists.linux-erofs
Message-ID <[email protected]> 
On Tue, 10 Mar 2026 12:49:23 +0100
Philipp Hahn <[email protected]> wrote:

> Prefer using IS_ERR_OR_NULL() over using IS_ERR() and a manual NULL
> check.
> 
> Semantich change: Previously the code only printed the warning on error,
> but not when the pointer was NULL. Now the warning is printed in both
> cases!
> 
> Change found with coccinelle.
> 
> To: Philipp Zabel <[email protected]>
> Cc: [email protected]
> Signed-off-by: Philipp Hahn <[email protected]>
> ---
>  drivers/reset/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
> index fceec45c8afc1e74fe46311bdc023ff257e8d770..649bb4ebabb20a09349ccbfc62f8280621df450e 100644
> --- a/drivers/reset/core.c
> +++ b/drivers/reset/core.c
> @@ -715,7 +715,7 @@ EXPORT_SYMBOL_GPL(reset_control_bulk_acquire);
>   */
>  void reset_control_release(struct reset_control *rstc)
>  {
> -	if (!rstc || WARN_ON(IS_ERR(rstc)))
> +	if (WARN_ON(IS_ERR_OR_NULL(rstc)))

This changes the behavior when rstc == NULL.
WARN_ON does not hit when rstc == NULL in the original code.

Thanks,

>  		return;
>  
>  	if (reset_control_is_array(rstc))
> 
> -- 
> 2.43.0
> 
> 


-- 
Masami Hiramatsu (Google) <[email protected]>