Hi This is the 2nd revision of reliable unplug support for DRM. As revoke support for the generic VFS layer is still not even close to being merged, this fixes the generic DRM layer to handle unplugged devices gracefully. This series fixes the DRM core to track any running f_ops. During device unplugging (which is the same as revoke()) we mark a device as unplugged so no new f_ops are started. Then we wait for running f_ops to finish and then close all open files (and leave just dummies behind). Now we can unregister the device without waiting for userspace to call close() on all fds. Any comments are welcome. Drivers which provide their own f_ops need to be fixed, other than that this is already working. Tested with udl locally. Running applications get poll(HUP) or SIGBUS for mmaps depending on what they're doing if they access the device after unplugging. Thanks David David Herrmann (6): percpu_rw_semaphore: export symbols for modules percpu_rw_semaphore: add percpu_down_read_trylock() drm: split drm_release() drm: make dev->unplugged reliable drm: make drm_dev_unregister() immediate drm: zap mmaps for dead devices drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/drm_drv.c | 5 +- drivers/gpu/drm/drm_fops.c | 111 ++++++++++++++------- drivers/gpu/drm/drm_gem.c | 10 +- drivers/gpu/drm/drm_stub.c | 192 ++++++++++++++++++++++++++++++------ drivers/gpu/drm/drm_vm.c | 3 +- drivers/gpu/drm/udl/udl_connector.c | 2 +- drivers/gpu/drm/udl/udl_drv.c | 2 +- drivers/gpu/drm/udl/udl_fb.c | 4 +- include/drm/drmP.h | 27 +++-- include/linux/percpu-rwsem.h | 1 + lib/Makefile | 2 +- lib/percpu-rwsem.c | 27 +++++ 13 files changed, 296 insertions(+), 91 deletions(-) -- 1.8.4.1 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
