From f61d500820d08be2cbce38bfe585a3ed009d2627 Mon Sep 17 00:00:00 2001 From: Sylwester Nawrocki Date: Wed, 29 Jun 2016 06:31:30 -0300 Subject: [PATCH] [media] exynos4-is: Fix buffer release issue on fimc m2m video nodes This fixes dropping ownership of buffers in the driver's stop_streaming callback, so buffers on the memory-to-memory video nodes are properly released, also in case when the driver has a buffer only on one of the queues (OUTPUT, CAPTURE) before the video node close. The issue was being reported by videobuf2 with a following warning while checking q->owned_by_drv_count: [ 2498.310766] WARNING: CPU: 0 PID: 9358 at drivers/media/v4l2-core/videobuf2-core.c:1818 __vb2_queue_cancel+0xe8/0x14c [ 2498.320258] Modules linked in: [ 2498.323212] CPU: 0 PID: 9358 Comm: v4l2_decode Not tainted 4.7.0-rc4-next-20160627 #1210 [ 2498.331284] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 2498.331327] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 2498.331344] [] (show_stack) from [] (dump_stack+0x74/0x94) [ 2498.331358] [] (dump_stack) from [] (__warn+0xd4/0x100) [ 2498.331369] [] (__warn) from [] (warn_slowpath_null+0x20/0x28) [ 2498.331381] [] (warn_slowpath_null) from [] (__vb2_queue_cancel+0xe8/0x14c) [ 2498.331395] [] (__vb2_queue_cancel) from [] (vb2_core_queue_release+0x18/0x38) [ 2498.331406] [] (vb2_core_queue_release) from [] (v4l2_m2m_ctx_release+0x1c/0x28) [ 2498.331420] [] (v4l2_m2m_ctx_release) from [] (fimc_m2m_release+0x24/0x78) [ 2498.331437] [] (fimc_m2m_release) from [] (v4l2_release+0x34/0x74) [ 2498.331455] [] (v4l2_release) from [] (__fput+0x80/0x1bc) [ 2498.331469] [] (__fput) from [] (task_work_run+0xc0/0xe4) [ 2498.331482] [] (task_work_run) from [] (do_exit+0x304/0xa24) [ 2498.331493] [] (do_exit) from [] (do_group_exit+0x3c/0xbc) [ 2498.331505] [] (do_group_exit) from [] (get_signal+0x200/0x65c) [ 2498.331517] [] (get_signal) from [] (do_signal+0x84/0x3c4) [ 2498.331532] [] (do_signal) from [] (do_work_pending+0xa4/0xb4) [ 2498.331545] [] (do_work_pending) from [] (slow_work_pending+0xc/0x20) Reported-by: Marek Szyprowski Signed-off-by: Sylwester Nawrocki Signed-off-by: Kamil Debski Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/exynos4-is/fimc-m2m.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/drivers/media/platform/exynos4-is/fimc-m2m.c b/drivers/media/platform/exynos4-is/fimc-m2m.c index 55ec4c9..ec1c762 100644 --- a/drivers/media/platform/exynos4-is/fimc-m2m.c +++ b/drivers/media/platform/exynos4-is/fimc-m2m.c @@ -50,30 +50,28 @@ void fimc_m2m_job_finish(struct fimc_ctx *ctx, int vb_state) src_vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); dst_vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx); - if (src_vb && dst_vb) { + if (src_vb) v4l2_m2m_buf_done(src_vb, vb_state); + if (dst_vb) v4l2_m2m_buf_done(dst_vb, vb_state); + if (src_vb && dst_vb) v4l2_m2m_job_finish(ctx->fimc_dev->m2m.m2m_dev, ctx->fh.m2m_ctx); - } } /* Complete the transaction which has been scheduled for execution. */ -static int fimc_m2m_shutdown(struct fimc_ctx *ctx) +static void fimc_m2m_shutdown(struct fimc_ctx *ctx) { struct fimc_dev *fimc = ctx->fimc_dev; - int ret; if (!fimc_m2m_pending(fimc)) - return 0; + return; fimc_ctx_state_set(FIMC_CTX_SHUT, ctx); - ret = wait_event_timeout(fimc->irq_queue, - !fimc_ctx_state_is_set(FIMC_CTX_SHUT, ctx), - FIMC_SHUTDOWN_TIMEOUT); - - return ret == 0 ? -ETIMEDOUT : ret; + wait_event_timeout(fimc->irq_queue, + !fimc_ctx_state_is_set(FIMC_CTX_SHUT, ctx), + FIMC_SHUTDOWN_TIMEOUT); } static int start_streaming(struct vb2_queue *q, unsigned int count) @@ -88,12 +86,10 @@ static int start_streaming(struct vb2_queue *q, unsigned int count) static void stop_streaming(struct vb2_queue *q) { struct fimc_ctx *ctx = q->drv_priv; - int ret; - ret = fimc_m2m_shutdown(ctx); - if (ret == -ETIMEDOUT) - fimc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR); + fimc_m2m_shutdown(ctx); + fimc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR); pm_runtime_put(&ctx->fimc_dev->pdev->dev); } -- 2.7.4