linux-kernel - Re: [PATCH] firmware: arm_ffa: fix ffa_notification_info

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Date: Fri, 8 Mar 2024 10:09:21 +0100
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: Jens Wiklander <jens.wiklander@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Sudeep Holla <sudeep.holla@....com>,
	Marc Bonnici <marc.bonnici@....com>,
	Olivier Deprez <Olivier.Deprez@....com>
Subject: Re: [PATCH] firmware: arm_ffa: fix ffa_notification_info_get()

On Thu, Mar 07, 2024 at 10:21:04AM +0100, Jens Wiklander wrote:
> FFA_NOTIFICATION_INFO_GET retries information about pending

s/retries/retrieves/

> notifications. Notifications can be either global or per VCPU. Global
> notifications are represented by the VM ID only, or 0 in the absence of
> a hypervisor.

I would just say "Global notifications are reported with the partition
ID only in the list of endpoints with pending notifications".

> ffa_notification_info_get() incorrectly expect no ID at all
> for global notifications. Fix this by checking for 1 ID instead of 0.
> 
> Fixes: 3522be48d82b ("firmware: arm_ffa: Implement the NOTIFICATION_INFO_GET interface")
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
>  drivers/firmware/arm_ffa/driver.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Lorenzo Pieralisi <lpieralisi@...nel.org>

> diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
> index c183c7d39c0f..ff1f37a4b28c 100644
> --- a/drivers/firmware/arm_ffa/driver.c
> +++ b/drivers/firmware/arm_ffa/driver.c
> @@ -790,7 +790,7 @@ static void ffa_notification_info_get(void)
>  
>  			part_id = packed_id_list[ids_processed++];
>  
> -			if (!ids_count[list]) { /* Global Notification */
> +			if (ids_count[list] == 1) { /* Global Notification */
>  				__do_sched_recv_cb(part_id, 0, false);
>  				continue;
>  			}
> -- 
> 2.34.1
>