Writeback jobs are allocated when the WRITEBACK_FB_ID is set, and deleted when the jobs complete. This results in both a memory leak of the job and a leak of the framebuffer if the atomic commit returns before the job is queued for processing, for instance if the atomic check fails or if the commit runs in test-only mode.
Fix this by implementing the drm_writeback_cleanup_job() function and calling it from __drm_atomic_helper_connector_destroy_state(). As writeback jobs are removed from the state when they're queued for processing, any job left in the state when the state gets destroyed needs to be cleaned up.
The existing declaration of the drm_writeback_cleanup_job() function without an implementation hints that this problem was considered, but never addressed.
Signed-off-by: Laurent Pinchart laurent.pinchart+renesas@ideasonboard.com --- drivers/gpu/drm/drm_atomic_state_helper.c | 4 ++++ drivers/gpu/drm/drm_writeback.c | 13 ++++++++++--- 2 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c index 4985384e51f6..59ffb6b9c745 100644 --- a/drivers/gpu/drm/drm_atomic_state_helper.c +++ b/drivers/gpu/drm/drm_atomic_state_helper.c @@ -30,6 +30,7 @@ #include <drm/drm_connector.h> #include <drm/drm_atomic.h> #include <drm/drm_device.h> +#include <drm/drm_writeback.h>
#include <linux/slab.h> #include <linux/dma-fence.h> @@ -412,6 +413,9 @@ __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
if (state->commit) drm_crtc_commit_put(state->commit); + + if (state->writeback_job) + drm_writeback_cleanup_job(state->writeback_job); } EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c index 338b993d7c9f..afb1ae6e0ecb 100644 --- a/drivers/gpu/drm/drm_writeback.c +++ b/drivers/gpu/drm/drm_writeback.c @@ -273,6 +273,14 @@ void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector, } EXPORT_SYMBOL(drm_writeback_queue_job);
+void drm_writeback_cleanup_job(struct drm_writeback_job *job) +{ + if (job->fb) + drm_framebuffer_put(job->fb); + + kfree(job); +} + /* * @cleanup_work: deferred cleanup of a writeback job * @@ -285,10 +293,9 @@ static void cleanup_work(struct work_struct *work) struct drm_writeback_job *job = container_of(work, struct drm_writeback_job, cleanup_work); - drm_framebuffer_put(job->fb); - kfree(job); -}
+ drm_writeback_cleanup_job(job); +}
/** * drm_writeback_signal_completion - Signal the completion of a writeback job