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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2018-03-27 10:23:54 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2018-03-28 17:07:36 +0200 |
| commit | ae358dacd217370cc362f1674712c4e9246ace8d (patch) | |
| tree | 049bc8fbf62f7ef091087ee0e5d9d017ebbfc116 /drivers/gpu/drm/udl/udl_gem.c | |
| parent | fcb1e57f79c0ecf4c85fecd2294a469367cbddd0 (diff) | |
| download | talos-obmc-linux-ae358dacd217370cc362f1674712c4e9246ace8d.tar.gz talos-obmc-linux-ae358dacd217370cc362f1674712c4e9246ace8d.zip | |
drm/udl: Get rid of dev->struct_mutex usage
It's only used to protect our page list, and only when we know we have
a full reference. This means none of these code paths can ever race
with the final unref, and hence we do not need dev->struct_mutex
serialization and can simply switch to our own locking.
For more context the only magic the locked gem_free_object provides is
that it prevents concurrent final unref (and destruction) of gem
objects while anyone is holding dev->struct_mutex. This was used by
i915 (and other drivers) to implement eviction handling with less
headaches.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180327082356.24516-3-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/udl/udl_gem.c')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_gem.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c index dee6bd9a3dd1..9a15cce22cce 100644 --- a/drivers/gpu/drm/udl/udl_gem.c +++ b/drivers/gpu/drm/udl/udl_gem.c @@ -214,9 +214,10 @@ int udl_gem_mmap(struct drm_file *file, struct drm_device *dev, { struct udl_gem_object *gobj; struct drm_gem_object *obj; + struct udl_device *udl = dev->dev_private; int ret = 0; - mutex_lock(&dev->struct_mutex); + mutex_lock(&udl->gem_lock); obj = drm_gem_object_lookup(file, handle); if (obj == NULL) { ret = -ENOENT; @@ -236,6 +237,6 @@ int udl_gem_mmap(struct drm_file *file, struct drm_device *dev, out: drm_gem_object_put(&gobj->base); unlock: - mutex_unlock(&dev->struct_mutex); + mutex_unlock(&udl->gem_lock); return ret; } |
