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Chris Wilson 39b4d07aa3 drm: Hold the mutex when dropping the last GEM reference (v2) ... In order to be fully threadsafe we need to check that the drm_gem_object refcount is still 0 after acquiring the mutex in order to call the free function. Otherwise, we may encounter scenarios like: Thread A: Thread B: drm_gem_close unreference_unlocked kref_put mutex_lock ... i915_gem_evict ... kref_get -> BUG ... i915_gem_unbind ... kref_put ... i915_gem_object_free ... mutex_unlock mutex_lock i915_gem_object_free -> BUG i915_gem_object_unbind kfree mutex_unlock Note that no driver is currently using the free_unlocked vfunc and it is scheduled for removal, hasten that process. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30454 Reported-and-Tested-by: Magnus Kessler <Magnus.Kessler@gmx.net> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>		15 years ago
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i2c	…
ttm	…
Kbuild	…
drm.h	…
drmP.h	drm: Hold the mutex when dropping the last GEM reference (v2)	15 years ago
drm_buffer.h	…
drm_cache.h	…
drm_core.h	…
drm_crtc.h	drm: Use a nondestructive mode for output detect when polling (v2)	15 years ago
drm_crtc_helper.h	…
drm_dp_helper.h	…
drm_edid.h	…
drm_encoder_slave.h	…
drm_fb_helper.h	…
drm_fixed.h	…
drm_global.h	…
drm_hashtab.h	…
drm_mem_util.h	…
drm_memory.h	…
drm_mm.h	…
drm_mode.h	…
drm_os_linux.h	…
drm_pciids.h	drm/radeon: fix PCI ID 5657 to be an RV410	15 years ago
drm_sarea.h	…
drm_sman.h	…
drm_sysfs.h	…
i810_drm.h	…
i830_drm.h	drm: block userspace under allocating buffer and having drivers overwrite it (v2)	15 years ago
i915_drm.h	Merge branch 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6	15 years ago
mga_drm.h	drm: block userspace under allocating buffer and having drivers overwrite it (v2)	15 years ago
nouveau_drm.h	drm: block userspace under allocating buffer and having drivers overwrite it (v2)	15 years ago
r128_drm.h	…
radeon_drm.h	drm: block userspace under allocating buffer and having drivers overwrite it (v2)	15 years ago
savage_drm.h	drm: block userspace under allocating buffer and having drivers overwrite it (v2)	15 years ago
sis_drm.h	…
via_drm.h	…
vmwgfx_drm.h	…