[media] exynos4-is: Ensure proper media pipeline state on device close

Make sure media_entity_pipeline_stop() is called on video device
close in cases where there was VIDIOC_STREAMON ioctl and no
VIDIOC_STREAMOFF. This patch fixes media entities stream_count
state which could prevent links from being disconnected, due to
non-zero stream_count.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 29 insertions, 9 deletions

diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
index 965b07f36e3c..28c6b26f6ff5 100644
--- a/drivers/media/platform/exynos4-is/fimc-capture.c
+++ b/drivers/media/platform/exynos4-is/fimc-capture.c
@@ -551,6 +551,7 @@ unlock:
 static int fimc_capture_release(struct file *file)
 {
         struct fimc_dev *fimc = video_drvdata(file);
+        struct fimc_vid_cap *vc = &fimc->vid_cap;
         int ret;
 
         dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);
@@ -558,6 +559,10 @@ static int fimc_capture_release(struct file *file)
         mutex_lock(&fimc->lock);
 
         if (v4l2_fh_is_singular_file(file)) {
+                if (vc->streaming) {
+                        media_entity_pipeline_stop(&vc->vfd.entity);
+                        vc->streaming = false;
+                }
                 clear_bit(ST_CAPT_BUSY, &fimc->state);
                 fimc_stop_capture(fimc, false);
                 fimc_pipeline_call(fimc, close, &fimc->pipeline);
@@ -1243,8 +1248,10 @@ static int fimc_cap_streamon(struct file *file, void *priv,
         }
 
         ret = vb2_ioctl_streamon(file, priv, type);
-        if (!ret)
+        if (!ret) {
+                vc->streaming = true;
                 return ret;
+        }
 
 err_p_stop:
         media_entity_pipeline_stop(entity);
@@ -1258,11 +1265,12 @@ static int fimc_cap_streamoff(struct file *file, void *priv,
         int ret;
 
         ret = vb2_ioctl_streamoff(file, priv, type);
+        if (ret < 0)
+                return ret;
 
-        if (ret == 0)
-                media_entity_pipeline_stop(&fimc->vid_cap.vfd.entity);
-
-        return ret;
+        media_entity_pipeline_stop(&fimc->vid_cap.vfd.entity);
+        fimc->vid_cap.streaming = false;
+        return 0;
 }
 
 static int fimc_cap_reqbufs(struct file *file, void *priv,
diff --git a/drivers/media/platform/exynos4-is/fimc-core.h b/drivers/media/platform/exynos4-is/fimc-core.h
index 7d361b24dfd7..d2fe162485a3 100644
--- a/drivers/media/platform/exynos4-is/fimc-core.h
+++ b/drivers/media/platform/exynos4-is/fimc-core.h
@@ -319,6 +319,7 @@ struct fimc_vid_cap {
         int                             buf_index;
         unsigned int                    frame_count;
         unsigned int                    reqbufs_count;
+        bool                            streaming;
         int                             input_index;
         int                             refcnt;
         u32                             input;
diff --git a/drivers/media/platform/exynos4-is/fimc-lite.c b/drivers/media/platform/exynos4-is/fimc-lite.c
index b11e3583b9fa..cb196b85a858 100644
--- a/drivers/media/platform/exynos4-is/fimc-lite.c
+++ b/drivers/media/platform/exynos4-is/fimc-lite.c
@@ -507,6 +507,10 @@ static int fimc_lite_release(struct file *file)
 
         if (v4l2_fh_is_singular_file(file) &&
             atomic_read(&fimc->out_path) == FIMC_IO_DMA) {
+                if (fimc->streaming) {
+                        media_entity_pipeline_stop(&fimc->vfd.entity);
+                        fimc->streaming = false;
+                }
                 clear_bit(ST_FLITE_IN_USE, &fimc->state);
                 fimc_lite_stop_capture(fimc, false);
                 fimc_pipeline_call(fimc, close, &fimc->pipeline);
@@ -798,8 +802,11 @@ static int fimc_lite_streamon(struct file *file, void *priv,
                 goto err_p_stop;
 
         ret = vb2_ioctl_streamon(file, priv, type);
-        if (!ret)
+        if (!ret) {
+                fimc->streaming = true;
                 return ret;
+        }
+
 err_p_stop:
         media_entity_pipeline_stop(entity);
         return 0;
@@ -812,9 +819,12 @@ static int fimc_lite_streamoff(struct file *file, void *priv,
         int ret;
 
         ret = vb2_ioctl_streamoff(file, priv, type);
-        if (ret == 0)
-                media_entity_pipeline_stop(&fimc->vfd.entity);
-        return ret;
+        if (ret < 0)
+                return ret;
+
+        media_entity_pipeline_stop(&fimc->vfd.entity);
+        fimc->streaming = false;
+        return 0;
 }
 
 static int fimc_lite_reqbufs(struct file *file, void *priv,
diff --git a/drivers/media/platform/exynos4-is/fimc-lite.h b/drivers/media/platform/exynos4-is/fimc-lite.h
index 8a8d26f58344..71fed5129e30 100644
--- a/drivers/media/platform/exynos4-is/fimc-lite.h
+++ b/drivers/media/platform/exynos4-is/fimc-lite.h
@@ -166,6 +166,7 @@ struct fimc_lite {
         int                     ref_count;
 
         struct fimc_lite_events events;
+        bool                    streaming;
 };
 
 static inline bool fimc_lite_active(struct fimc_lite *fimc)