This is a note to let you know that I've just added the patch titled
drm: Wrap direct calls to driver->gem_free_object from CMA
to the 4.6-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-wrap-direct-calls-to-driver-gem_free_object-from-cma.patch
and it can be found in the queue-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From afe705be38f1e65b173868486944377186b9f206 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Tue, 31 May 2016 22:25:52 +0100
Subject: drm: Wrap direct calls to driver->gem_free_object from CMA
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
commit afe705be38f1e65b173868486944377186b9f206 upstream.
Since the introduction of (struct_mutex) lockless GEM bo freeing, there
are a pair of driver vfuncs for freeing the GEM bo, of which the driver
may choose to only implement driver->gem_object_free_unlocked (and so
avoid taking the struct_mutex along the free path). However, the CMA GEM
helpers were still calling driver->gem_free_object directly, now NULL,
and promptly dying on the fancy new lockless drivers. Oops.
Robert Foss bisected this to b82caafcf2303 (drm/vc4: Use lockless gem BO
free callback) on his vc4 device, but that just serves as an enabler for
9f0ba539d13ae (drm/gem: support BO freeing without dev->struct_mutex).
Reported-by: Robert Foss <robert.foss@xxxxxxxxxxxxx>
Fixes: 9f0ba539d13ae (drm/gem: support BO freeing without dev->struct_mutex)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Robert Foss <robert.foss@xxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Eric Anholt <eric@xxxxxxxxxx>
Cc: Alex Deucher <alexdeucher@xxxxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Tested-by: Robert Foss <robert.foss@xxxxxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_fb_cma_helper.c | 2 +-
drivers/gpu/drm/drm_gem_cma_helper.c | 12 +++---------
2 files changed, 4 insertions(+), 10 deletions(-)
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -301,7 +301,7 @@ static int drm_fbdev_cma_create(struct d
err_fb_info_destroy:
drm_fb_helper_release_fbi(helper);
err_gem_free_object:
- dev->driver->gem_free_object(&obj->base);
+ drm_gem_object_unreference_unlocked(&obj->base);
return ret;
}
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -121,7 +121,7 @@ struct drm_gem_cma_object *drm_gem_cma_c
return cma_obj;
error:
- drm->driver->gem_free_object(&cma_obj->base);
+ drm_gem_object_unreference_unlocked(&cma_obj->base);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_create);
@@ -162,18 +162,12 @@ drm_gem_cma_create_with_handle(struct dr
* and handle has the id what user can see.
*/
ret = drm_gem_handle_create(file_priv, gem_obj, handle);
- if (ret)
- goto err_handle_create;
-
/* drop reference from allocate - handle holds it now. */
drm_gem_object_unreference_unlocked(gem_obj);
+ if (ret)
+ return ERR_PTR(ret);
return cma_obj;
-
-err_handle_create:
- drm->driver->gem_free_object(gem_obj);
-
- return ERR_PTR(ret);
}
/**
Patches currently in stable-queue which might be from chris@xxxxxxxxxxxxxxxxxx are
queue-4.6/sched-fair-fix-cfs_rq-avg-tracking-underflow.patch
queue-4.6/drm-i915-update-ifdeffery-for-mutex-owner.patch
queue-4.6/drm-wrap-direct-calls-to-driver-gem_free_object-from-cma.patch
queue-4.6/locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch
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