media: mem2mem: Make .job_abort optional

Implementing job_abort() does not make sense on some drivers.
This is not a problem, as the abort is not required to
wait for the job to finish. Quite the opposite, drivers
are encouraged not to wait.

Demote v4l2_m2m_ops.job_abort from required to optional, and
clean all drivers with dummy implementations.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

8 files changed, 4 insertions, 37 deletions

diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
index 328e8f650d9b..4f24da8afecc 100644
--- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
@@ -861,14 +861,9 @@ static int mtk_jpeg_job_ready(void *priv)
         return (ctx->state == MTK_JPEG_RUNNING) ? 1 : 0;
 }
 
-static void mtk_jpeg_job_abort(void *priv)
-{
-}
-
 static const struct v4l2_m2m_ops mtk_jpeg_m2m_ops = {
         .device_run = mtk_jpeg_device_run,
         .job_ready  = mtk_jpeg_job_ready,
-        .job_abort  = mtk_jpeg_job_abort,
 };
 
 static int mtk_jpeg_queue_init(void *priv, struct vb2_queue *src_vq,
diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
index c2e2f5f1ebf1..ceffc31cc6eb 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
@@ -441,10 +441,6 @@ static void mtk_mdp_m2m_stop_streaming(struct vb2_queue *q)
         pm_runtime_put(&ctx->mdp_dev->pdev->dev);
 }
 
-static void mtk_mdp_m2m_job_abort(void *priv)
-{
-}
-
 /* The color format (num_planes) must be already configured. */
 static void mtk_mdp_prepare_addr(struct mtk_mdp_ctx *ctx,
                                  struct vb2_buffer *vb,
@@ -1215,7 +1211,6 @@ static const struct v4l2_file_operations mtk_mdp_m2m_fops = {
 
 static const struct v4l2_m2m_ops mtk_mdp_m2m_ops = {
         .device_run     = mtk_mdp_m2m_device_run,
-        .job_abort      = mtk_mdp_m2m_job_abort,
 };
 
 int mtk_mdp_register_m2m_device(struct mtk_mdp_dev *mdp)
diff --git a/drivers/media/platform/rcar_jpu.c b/drivers/media/platform/rcar_jpu.c
index 90d40b2d6259..a808258a4180 100644
--- a/drivers/media/platform/rcar_jpu.c
+++ b/drivers/media/platform/rcar_jpu.c
@@ -1492,13 +1492,8 @@ static void jpu_device_run(void *priv)
         spin_unlock_irqrestore(&ctx->jpu->lock, flags);
 }
 
-static void jpu_job_abort(void *priv)
-{
-}
-
 static const struct v4l2_m2m_ops jpu_m2m_ops = {
         .device_run     = jpu_device_run,
-        .job_abort      = jpu_job_abort,
 };
 
 /*
diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
index 8ace1873202a..69a2797d7bbe 100644
--- a/drivers/media/platform/rockchip/rga/rga.c
+++ b/drivers/media/platform/rockchip/rga/rga.c
@@ -39,11 +39,6 @@
 static int debug;
 module_param(debug, int, 0644);
 
-static void job_abort(void *prv)
-{
-        /* Can't do anything rational here */
-}
-
 static void device_run(void *prv)
 {
         struct rga_ctx *ctx = prv;
@@ -104,7 +99,6 @@ static irqreturn_t rga_isr(int irq, void *prv)
 
 static struct v4l2_m2m_ops rga_m2m_ops = {
         .device_run = device_run,
-        .job_abort = job_abort,
 };
 
 static int
diff --git a/drivers/media/platform/s5p-g2d/g2d.c b/drivers/media/platform/s5p-g2d/g2d.c
index ee7322b33666..e901201b6fcc 100644
--- a/drivers/media/platform/s5p-g2d/g2d.c
+++ b/drivers/media/platform/s5p-g2d/g2d.c
@@ -483,10 +483,6 @@ static int vidioc_s_crop(struct file *file, void *prv, const struct v4l2_crop *c
         return 0;
 }
 
-static void job_abort(void *prv)
-{
-}
-
 static void device_run(void *prv)
 {
         struct g2d_ctx *ctx = prv;
@@ -605,7 +601,6 @@ static const struct video_device g2d_videodev = {
 
 static const struct v4l2_m2m_ops g2d_m2m_ops = {
         .device_run     = device_run,
-        .job_abort      = job_abort,
 };
 
 static const struct of_device_id exynos_g2d_match[];
diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
index 79b63da27f53..04fd2e0493c0 100644
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
@@ -2467,26 +2467,19 @@ static int s5p_jpeg_job_ready(void *priv)
         return 1;
 }
 
-static void s5p_jpeg_job_abort(void *priv)
-{
-}
-
 static struct v4l2_m2m_ops s5p_jpeg_m2m_ops = {
         .device_run     = s5p_jpeg_device_run,
         .job_ready      = s5p_jpeg_job_ready,
-        .job_abort      = s5p_jpeg_job_abort,
 };
 
 static struct v4l2_m2m_ops exynos3250_jpeg_m2m_ops = {
         .device_run     = exynos3250_jpeg_device_run,
         .job_ready      = s5p_jpeg_job_ready,
-        .job_abort      = s5p_jpeg_job_abort,
 };
 
 static struct v4l2_m2m_ops exynos4_jpeg_m2m_ops = {
         .device_run     = exynos4_jpeg_device_run,
         .job_ready      = s5p_jpeg_job_ready,
-        .job_abort      = s5p_jpeg_job_abort,
 };
 
 /*
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 725da74d15d8..4aeedb91594a 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -322,7 +322,8 @@ static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
         m2m_ctx->job_flags |= TRANS_ABORT;
         if (m2m_ctx->job_flags & TRANS_RUNNING) {
                 spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
-                m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
+                if (m2m_dev->m2m_ops->job_abort)
+                        m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);
                 dprintk("m2m_ctx %p running, will wait to complete", m2m_ctx);
                 wait_event(m2m_ctx->finished,
                                 !(m2m_ctx->job_flags & TRANS_RUNNING));
@@ -788,8 +789,7 @@ struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops)
 {
         struct v4l2_m2m_dev *m2m_dev;
 
-        if (!m2m_ops || WARN_ON(!m2m_ops->device_run) ||
-                        WARN_ON(!m2m_ops->job_abort))
+        if (!m2m_ops || WARN_ON(!m2m_ops->device_run))
                 return ERR_PTR(-EINVAL);
 
         m2m_dev = kzalloc(sizeof *m2m_dev, GFP_KERNEL);
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index af48b1eca025..d60d3060f762 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -32,7 +32,7 @@
  *              assumed that one source and one destination buffer are all
  *              that is required for the driver to perform one full transaction.
  *              This method may not sleep.
- * @job_abort:  required. Informs the driver that it has to abort the currently
+ * @job_abort:  optional. Informs the driver that it has to abort the currently
  *              running transaction as soon as possible (i.e. as soon as it can
  *              stop the device safely; e.g. in the next interrupt handler),
  *              even if the transaction would not have been finished by then.