Re: [PATCH v0 06/42] firmware: Check notifier registration return value

[Cristian Marussi]

On Mon, Nov 08, 2021 at 11:11:21AM +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@xxxxxxx>
> 
> Avoid homegrown notifier registration checks.
> 
> No functional changes.
> 
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> ---

Hi Borislav,

same observations I made on ccree patch in this series holds here too.

Moreover you should use get_maintainer.pl script to properly Cc people
(reviewers/maintainers) beside mailing lists (I saw this by chance...):
as an additional note this patch also merges together two fixes for 2
completely different things (it should be split).

But, anyway, most of all, as said for ccree, I don't see the reason for
these kind of fixes given the internals of notifier core.

Thanks,
Cristian

>  drivers/firmware/arm_scmi/notify.c | 3 ++-
>  drivers/firmware/google/gsmi.c     | 6 ++++--
>  2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c
> index 0efd20cd9d69..f4c42ac00c63 100644
> --- a/drivers/firmware/arm_scmi/notify.c
> +++ b/drivers/firmware/arm_scmi/notify.c
> @@ -1358,7 +1358,8 @@ static int scmi_notifier_register(const struct scmi_handle *handle,
>  	if (!hndl)
>  		return -EINVAL;
>  
> -	blocking_notifier_chain_register(&hndl->chain, nb);
> +	if (blocking_notifier_chain_register(&hndl->chain, nb))
> +		pr_warn("SCMI notifier already registered\n");
>  
>  	/* Enable events for not pending handlers */
>  	if (!IS_HNDL_PENDING(hndl)) {
> diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
> index adaa492c3d2d..a658e7c106c3 100644
> --- a/drivers/firmware/google/gsmi.c
> +++ b/drivers/firmware/google/gsmi.c
> @@ -1030,8 +1030,10 @@ static __init int gsmi_init(void)
>  
>  	register_reboot_notifier(&gsmi_reboot_notifier);
>  	register_die_notifier(&gsmi_die_notifier);
> -	atomic_notifier_chain_register(&panic_notifier_list,
> -				       &gsmi_panic_notifier);
> +
> +	if (atomic_notifier_chain_register(&panic_notifier_list,
> +					   &gsmi_panic_notifier))
> +		pr_warn("gsmi panic notifier already registered\n");
>  
>  	printk(KERN_INFO "gsmi version " DRIVER_VERSION " loaded\n");
>  
> -- 
> 2.29.2
> 
> 
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