linux-kernel - [PATCH 3.12 078/123] drm/radeon: take the mode_config mutex when dealing with hpds (v2)

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Date:	Tue,  4 Aug 2015 16:40:22 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alex Deucher <alexander.deucher@....com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 078/123] drm/radeon: take the mode_config mutex when dealing with hpds (v2)

From: Alex Deucher <alexander.deucher@....com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 39fa10f7e21574a70cecf1fed0f9b36535aa68a0 upstream.

Since we are messing with state in the worker.

v2: drop the changes in the mst worker

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/gpu/drm/radeon/radeon_irq_kms.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index a1a843058369..4a2d91536a8d 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -73,10 +73,12 @@ static void radeon_hotplug_work_func(struct work_struct *work)
 	struct drm_mode_config *mode_config = &dev->mode_config;
 	struct drm_connector *connector;
 
+	mutex_lock(&mode_config->mutex);
 	if (mode_config->num_connector) {
 		list_for_each_entry(connector, &mode_config->connector_list, head)
 			radeon_connector_hotplug(connector);
 	}
+	mutex_unlock(&mode_config->mutex);
 	/* Just fire off a uevent and let userspace tell us what to do */
 	drm_helper_hpd_irq_event(dev);
 }
-- 
2.5.0

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