This is a note to let you know that I've just added the patch titled
drm/udl: Use unlocked gem unreferencing
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-udl-use-unlocked-gem-unreferencing.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@xxxxxxxxxxxxxxx> know about it.
>From 72b9ff0612ad8fc969b910cd00ac16b57a1a9ba4 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Wed, 30 Mar 2016 11:40:43 +0200
Subject: drm/udl: Use unlocked gem unreferencing
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
commit 72b9ff0612ad8fc969b910cd00ac16b57a1a9ba4 upstream.
For drm_gem_object_unreference callers are required to hold
dev->struct_mutex, which these paths don't. Enforcing this requirement
has become a bit more strict with
commit ef4c6270bf2867e2f8032e9614d1a8cfc6c71663
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Thu Oct 15 09:36:25 2015 +0200
drm/gem: Check locking in drm_gem_object_unreference
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/udl/udl_fb.c | 2 +-
drivers/gpu/drm/udl/udl_gem.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -539,7 +539,7 @@ static int udlfb_create(struct drm_fb_he
out_destroy_fbi:
drm_fb_helper_release_fbi(helper);
out_gfree:
- drm_gem_object_unreference(&ufbdev->ufb.obj->base);
+ drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
out:
return ret;
}
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -52,7 +52,7 @@ udl_gem_create(struct drm_file *file,
return ret;
}
- drm_gem_object_unreference(&obj->base);
+ drm_gem_object_unreference_unlocked(&obj->base);
*handle_p = handle;
return 0;
}
Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are
queue-4.4/drm-dp-move-hw_mutex-up-the-call-stack.patch
queue-4.4/drm-udl-use-unlocked-gem-unreferencing.patch
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