Patch "drm/nouveau/kms: take mode_config mutex in connector hotplug path" has been added to the 4.4-stable tree

Patch "drm/nouveau/kms: take mode_config mutex in connector hotplug path" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/nouveau/kms: take mode_config mutex in connector hotplug path

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-nouveau-kms-take-mode_config-mutex-in-connector-hotplug-path.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 0a882cadbc63fd2da3994af7115b4ada2fcbd638 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Fri, 8 Jan 2016 08:56:51 +1000
Subject: drm/nouveau/kms: take mode_config mutex in connector hotplug path

From: Ben Skeggs <bskeggs@redhat.com>

commit 0a882cadbc63fd2da3994af7115b4ada2fcbd638 upstream.

fdo#93634

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nouveau_connector.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -969,10 +969,13 @@ nouveau_connector_hotplug(struct nvif_no
 
 		NV_DEBUG(drm, "%splugged %s\n", plugged ? "" : "un", name);
 
+		mutex_lock(&drm->dev->mode_config.mutex);
 		if (plugged)
 			drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
 		else
 			drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
+		mutex_unlock(&drm->dev->mode_config.mutex);
+
 		drm_helper_hpd_irq_event(connector->dev);
 	}
 


Patches currently in stable-queue which might be from bskeggs@redhat.com are

queue-4.4/drm-nouveau-platform-fix-deferred-probe.patch
queue-4.4/drm-nouveau-kms-take-mode_config-mutex-in-connector-hotplug-path.patch
queue-4.4/drm-nouveau-display-enable-vblank-irqs-after-display-engine-is-on-again.patch
queue-4.4/drm-nouveau-disp-dp-ensure-sink-is-powered-up-before-attempting-link-training.patch