[PATCH 2/3] mem2mem: Make .job_abort optional

[Ezequiel Garcia <ezequiel@collabora.com>]

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 or wrong implementations.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
---
 drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c |  5 -----
 drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c    |  5 -----
 drivers/media/platform/rcar_jpu.c               | 16 ----------------
 drivers/media/platform/rockchip/rga/rga.c       |  6 ------
 drivers/media/platform/s5p-g2d/g2d.c            | 14 --------------
 drivers/media/platform/s5p-jpeg/jpeg-core.c     |  7 -------
 drivers/media/v4l2-core/v4l2-mem2mem.c          |  6 +++---
 include/media/v4l2-mem2mem.h                    |  2 +-
 8 files changed, 4 insertions(+), 57 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 583d47724ee8..1198e19060a2 100644
--- a/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
+++ b/drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c
@@ -455,10 +455,6 @@ 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,
@@ -1227,7 +1223,6 @@ 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 8b44a849ab41..10d24ddcea5f 100644
--- a/drivers/media/platform/rcar_jpu.c
+++ b/drivers/media/platform/rcar_jpu.c
@@ -198,7 +198,6 @@
  * @vfd_decoder: video device node for decoder mem2mem mode
  * @m2m_dev: v4l2 mem2mem device data
  * @curr: pointer to current context
- * @irq_queue:	interrupt handler waitqueue
  * @regs: JPEG IP registers mapping
  * @irq: JPEG IP irq
  * @clk: JPEG IP clock
@@ -213,7 +212,6 @@ struct jpu {
 	struct video_device	vfd_decoder;
 	struct v4l2_m2m_dev	*m2m_dev;
 	struct jpu_ctx		*curr;
-	wait_queue_head_t	irq_queue;
 
 	void __iomem		*regs;
 	unsigned int		irq;
@@ -1499,19 +1497,9 @@ static int jpu_job_ready(void *priv)
 	return 1;
 }
 
-static void jpu_job_abort(void *priv)
-{
-	struct jpu_ctx *ctx = priv;
-
-	if (!wait_event_timeout(ctx->jpu->irq_queue, !ctx->jpu->curr,
-				msecs_to_jiffies(JPU_JOB_TIMEOUT)))
-		jpu_cleanup(ctx, true);
-}
-
 static const struct v4l2_m2m_ops jpu_m2m_ops = {
 	.device_run	= jpu_device_run,
 	.job_ready	= jpu_job_ready,
-	.job_abort	= jpu_job_abort,
 };
 
 /*
@@ -1592,9 +1580,6 @@ static irqreturn_t jpu_irq_handler(int irq, void *dev_id)
 
 	v4l2_m2m_job_finish(jpu->m2m_dev, curr_ctx->fh.m2m_ctx);
 
-	/* ...wakeup abort routine if needed */
-	wake_up(&jpu->irq_queue);
-
 	return IRQ_HANDLED;
 
 handled:
@@ -1628,7 +1613,6 @@ static int jpu_probe(struct platform_device *pdev)
 	if (!jpu)
 		return -ENOMEM;
 
-	init_waitqueue_head(&jpu->irq_queue);
 	mutex_init(&jpu->mutex);
 	spin_lock_init(&jpu->lock);
 	jpu->dev = &pdev->dev;
diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
index 5a5a6139e18a..d833bb32a538 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 66aa8cf1d048..49cc2a70d1f3 100644
--- a/drivers/media/platform/s5p-g2d/g2d.c
+++ b/drivers/media/platform/s5p-g2d/g2d.c
@@ -481,19 +481,6 @@ static int vidioc_s_crop(struct file *file, void *prv, const struct v4l2_crop *c
 	return 0;
 }
 
-static void job_abort(void *prv)
-{
-	struct g2d_ctx *ctx = prv;
-	struct g2d_dev *dev = ctx->dev;
-
-	if (dev->curr == NULL) /* No job currently running */
-		return;
-
-	wait_event_timeout(dev->irq_queue,
-			   dev->curr == NULL,
-			   msecs_to_jiffies(G2D_TIMEOUT));
-}
-
 static void device_run(void *prv)
 {
 	struct g2d_ctx *ctx = prv;
@@ -613,7 +600,6 @@ 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 c4f963d96a79..7bae19ca611e 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -300,7 +300,8 @@ 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));
@@ -599,8 +600,7 @@ 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 8f4b208cfee7..c2d817d3ff42 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.
-- 
2.16.3