Patch "drm/dp/mst: Handle errors from drm_atomic_get_private_obj_state() correctly" has been added to the 4.13-stable tree

[<gregkh@linuxfoundation.org>]

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

    drm/dp/mst: Handle errors from drm_atomic_get_private_obj_state() correctly

to the 4.13-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-dp-mst-handle-errors-from-drm_atomic_get_private_obj_state-correctly.patch
and it can be found in the queue-4.13 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 56a91c4932bd038f3d1f6555ddc349ca4e6933b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Wed, 12 Jul 2017 18:51:00 +0300
Subject: drm/dp/mst: Handle errors from drm_atomic_get_private_obj_state() correctly
MIME-Version: 1.0
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From: Ville Syrjälä <ville.syrjala@linux.intel.com>

commit 56a91c4932bd038f3d1f6555ddc349ca4e6933b0 upstream.

On failure drm_atomic_get_private_obj_state() returns and error
pointer instead of NULL. Adjust the checks in the callers to match.

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: edb1ed1ab7d3 ("drm/dp: Add DP MST helpers to atomically find and release vcpi slots")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170712155102.26276-1-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_dp_mst_topology.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2540,8 +2540,8 @@ int drm_dp_atomic_find_vcpi_slots(struct
 	int req_slots;
 
 	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
-	if (topology_state == NULL)
-		return -ENOMEM;
+	if (IS_ERR(topology_state))
+		return PTR_ERR(topology_state);
 
 	port = drm_dp_get_validated_port_ref(mgr, port);
 	if (port == NULL)
@@ -2580,8 +2580,8 @@ int drm_dp_atomic_release_vcpi_slots(str
 	struct drm_dp_mst_topology_state *topology_state;
 
 	topology_state = drm_atomic_get_mst_topology_state(state, mgr);
-	if (topology_state == NULL)
-		return -ENOMEM;
+	if (IS_ERR(topology_state))
+		return PTR_ERR(topology_state);
 
 	/* We cannot rely on port->vcpi.num_slots to update
 	 * topology_state->avail_slots as the port may not exist if the parent


Patches currently in stable-queue which might be from ville.syrjala@linux.intel.com are

queue-4.13/drm-dp-mst-handle-errors-from-drm_atomic_get_private_obj_state-correctly.patch