linux-kernel - [PATCH V0 1/1] media: v4l2-core: Enable reserved field of v4l2

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Date:   Fri, 29 Apr 2022 17:15:03 +0530
From:   Naina Vaskenly <quic_nvaskenl@...cinc.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        lijian <lijian@...ong.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Kumar Anshuman <quic_anshuk@...cinc.com>,
        Naina Vaskenly <quic_nvaskenl@...cinc.com>
Subject: [PATCH V0 1/1] media: v4l2-core: Enable reserved field of v4l2_event

'reserved' member of struct v4l2_event is currently not enabled.
This field can be used to transfer data, if >64 bytes of data
has to be sent. Hence, added this change to copy the reserved field in
__v4l2_event_queue_fh.

Signed-off-by: Naina Vaskenly <quic_nvaskenl@...cinc.com>
---
 drivers/media/v4l2-core/v4l2-event.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c
index c5ce9f1..3d741cb 100644
--- a/drivers/media/v4l2-core/v4l2-event.c
+++ b/drivers/media/v4l2-core/v4l2-event.c
@@ -137,8 +137,10 @@ static void __v4l2_event_queue_fh(struct v4l2_fh *fh,
 	/* Take one and fill it. */
 	kev = sev->events + sev_pos(sev, sev->in_use);
 	kev->event.type = ev->type;
-	if (copy_payload)
+	if (copy_payload) {
 		kev->event.u = ev->u;
+		memcpy(kev->event.reserved, ev->reserved, sizeof(ev->reserved));
+	}
 	kev->event.id = ev->id;
 	kev->ts = ts;
 	kev->event.sequence = fh->sequence;
-- 
2.7.4