linux-kernel - [PATCH v2] firmware: arm_ffa: fix ffa_notification_info

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Message-Id: <20240311110700.2367142-1-jens.wiklander@linaro.org>
Date: Mon, 11 Mar 2024 12:07:00 +0100
From: Jens Wiklander <jens.wiklander@...aro.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Sudeep Holla <sudeep.holla@....com>
Cc: Marc Bonnici <marc.bonnici@....com>,
	Olivier Deprez <Olivier.Deprez@....com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Jens Wiklander <jens.wiklander@...aro.org>
Subject: [PATCH v2] firmware: arm_ffa: fix ffa_notification_info_get()

FFA_NOTIFICATION_INFO_GET retrieves information about pending
notifications. Notifications can be either global or per VCPU. 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>
Reviewed-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
---
 drivers/firmware/arm_ffa/driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index f2556a8e9401..9bc2e10381af 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