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

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Date: Thu,  7 Mar 2024 10:21:04 +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] firmware: arm_ffa: fix ffa_notification_info_get()

FFA_NOTIFICATION_INFO_GET retries information about pending
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. 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(-)

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