diff options
| author | David Herrmann <dh.herrmann@gmail.com> | 2013-10-20 18:37:27 +0200 |
|---|---|---|
| committer | David Herrmann <dh.herrmann@gmail.com> | 2013-10-20 18:48:33 +0200 |
| commit | b4cb0b594d55c09a54fc76d26834e38598518dd2 (patch) | |
| tree | b6a8c92eae5b331362f4a6ccde353828483dccfb | |
| parent | da688d3e640d3db1f1226e70cb2b8c115a79febb (diff) | |
drm: zap mmaps for dead devicesdrmrevoke
Once a DRM device is unregistered, user-space must not access any existing
mmaps, anymore. As we cannot rely on this, we now zap all of them in
drm_dev_unregister().
Any driver which wants to support that needs to protect their fault()
and mmap() handlers via drm_dev_get_active(), otherwise users can create
new mmaps after/during drm_dev_unregister().
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
| -rw-r--r-- | drivers/gpu/drm/drm_stub.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c index e363b72e6ad2..274a0051a73e 100644 --- a/drivers/gpu/drm/drm_stub.c +++ b/drivers/gpu/drm/drm_stub.c @@ -602,6 +602,10 @@ void drm_dev_unregister(struct drm_device *dev) drm_dev_shutdown(dev); + /* zap all memory mappings (drm_global_mutex must not be locked) */ + if (dev->dev_mapping) + unmap_mapping_range(dev->dev_mapping, 0, LLONG_MAX, 1); + /* We cannot hold drm_global_mutex during drm_dev_shutdown() as it might * dead-lock. Hence, there's a small race between drm_dev_shutdown() and * us locking drm_global_mutex which drm_release() might trigger. To fix |