From the docs for idr:

/* A typical clean-up sequence for objects stored in an idr tree, will * use idr_for_each() to free all objects, if necessary, then * idr_remove_all() to remove all ids, and idr_destroy() to free * up the cached idr_layers. */

We were missing the vital idr_rmove_all() step and so were leaking the used layers for every dri client:

unreferenced object 0xf32133c0 (size 148): comm "plymouthd", pid 131, jiffies 4294678490 (age 2308.030s) hex dump (first 32 bytes): 04 00 00 00 00 00 00 00 00 00 00 00 00 40 19 f3 .............@.. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<c04e5657>] create_object+0x124/0x1f1 [<c07cf100>] kmemleak_alloc+0x4c/0x90 [<c04db6a9>] kmem_cache_alloc+0xee/0x13c [<c05c3d25>] idr_pre_get+0x24/0x61 [<f8315c9c>] drm_gem_handle_create+0x27/0x7f [drm] [<f89925b2>] i915_gem_create_ioctl+0x4f/0x71 [i915] [<f83148ac>] drm_ioctl+0x272/0x356 [drm] [<c04f27c4>] vfs_ioctl+0x33/0x91 [<c04f31cf>] do_vfs_ioctl+0x46b/0x496 [<c04f3240>] sys_ioctl+0x46/0x66 [<c040325f>] sysenter_do_call+0x12/0x38 [<ffffffff>] 0xffffffff

Fixes https://bugzilla.kernel.org/show_bug.cgi?id=15803

Signed-off-by: Chris Wilson chris@chris-wilson.co.uk --- drivers/gpu/drm/drm_drv.c | 1 + drivers/gpu/drm/drm_gem.c | 1 + 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 4a66201..79b73cb 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -362,6 +362,7 @@ static void __exit drm_core_exit(void)

unregister_chrdev(DRM_MAJOR, "drm");

+ idr_remove_all(&drm_minors_idr); idr_destroy(&drm_minors_idr); }

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 830cb97..58bd0f7 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -419,6 +419,7 @@ drm_gem_release(struct drm_device *dev, struct drm_file *file_private) idr_for_each(&file_private->object_idr, &drm_gem_object_release_handle, NULL);

+ idr_remove_all(&file_private->object_idr); idr_destroy(&file_private->object_idr); }