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

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Date:   Wed,  8 Nov 2023 12:15:49 +0100
From:   Lorenzo Pieralisi <lpieralisi@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>
Subject: [PATCH] firmware: arm_ffa: Fix ffa_notification_info_get() IDs handling

To parse the retrieved ID lists appropriately in
ffa_notification_info_get() the ids_processed variable should not
be pre-incremented - we are dropping an identifier at the
beginning of the list.

Fix it by using the post-increment operator to increment the number
of processed IDs.

Fixes: 3522be48d82b ("firmware: arm_ffa: Implement the NOTIFICATION_INFO_GET interface")
Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/arm_ffa/driver.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 07b72c679247..ccf91a795c3d 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -782,7 +782,7 @@ static void ffa_notification_info_get(void)
 			if (ids_processed >= max_ids - 1)
 				break;
 
-			part_id = packed_id_list[++ids_processed];
+			part_id = packed_id_list[ids_processed++];
 
 			if (!ids_count[list]) { /* Global Notification */
 				__do_sched_recv_cb(part_id, 0, false);
@@ -794,7 +794,7 @@ static void ffa_notification_info_get(void)
 				if (ids_processed >= max_ids - 1)
 					break;
 
-				vcpu_id = packed_id_list[++ids_processed];
+				vcpu_id = packed_id_list[ids_processed++];
 
 				__do_sched_recv_cb(part_id, vcpu_id, true);
 			}
-- 
2.34.1