Re: [PATCH v0 08/42] Drivers: hv: vmbus: Check notifier registration return value

[Wei Liu]

On Mon, Nov 08, 2021 at 11:11:23AM +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-hyperv@xxxxxxxxxxxxxxx

Acked-by: Wei Liu <wei.liu@xxxxxxxxxx>

> ---
>  drivers/hv/vmbus_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 392c1ac4f819..370afd108d2d 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1574,8 +1574,8 @@ static int vmbus_bus_init(void)
>  	 * the VMbus channel connection to prevent any VMbus
>  	 * activity after the VM panics.
>  	 */
> -	atomic_notifier_chain_register(&panic_notifier_list,
> -			       &hyperv_panic_block);
> +	if (atomic_notifier_chain_register(&panic_notifier_list, &hyperv_panic_block))
> +		pr_warn("VMBus panic notifier already registered\n");
>  
>  	vmbus_request_offers();
>  
> -- 
> 2.29.2
>