linux-kernel - [PATCH v2 01/10] media: v4l2-ctrls: Add missing v4l2 ctrl unlock

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Message-Id: <20180419154124.17512-2-paul.kocialkowski@bootlin.com>
Date:   Thu, 19 Apr 2018 17:41:15 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Alexandre Courbot <acourbot@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: [PATCH v2 01/10] media: v4l2-ctrls: Add missing v4l2 ctrl unlock

This adds a missing v4l2_ctrl_unlock call that is required to avoid
deadlocks.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f67e9f5531fa..ba05a8b9a095 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -3614,10 +3614,12 @@ void v4l2_ctrl_request_complete(struct media_request *req,
 			continue;
 
 		v4l2_ctrl_lock(ctrl);
+
 		if (ref->req)
 			ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req);
 		else
 			ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req);
+
 		v4l2_ctrl_unlock(ctrl);
 	}
 
@@ -3677,8 +3679,11 @@ void v4l2_ctrl_request_setup(struct media_request *req,
 				}
 			}
 		}
-		if (!have_new_data)
+
+		if (!have_new_data) {
+			v4l2_ctrl_unlock(master);
 			continue;
+		}
 
 		for (i = 0; i < master->ncontrols; i++) {
 			if (master->cluster[i]) {
-- 
2.16.3