[media] s5p-fimc: Do not attempt to disable not enabled media pipeline

This fixes following warnings when all links are being disconnected:
[   20.080000] WARNING: at drivers/media/platform/s5p-fimc/fimc-mdevice.c:1269 __fimc_md_set_camclk+0x208/0x20c()
[   20.090000] Modules linked in:
[   20.095000] [<c001603c>] (unwind_backtrace+0x0/0x13c) from [<c00246dc>] (warn_slowpath_common+0x54/0x64)
[   20.105000] [<c00246dc>] (warn_slowpath_common+0x54/0x64) from [<c0024708>] (warn_slowpath_null+0x1c/0x24)
[   20.115000] [<c0024708>] (warn_slowpath_null+0x1c/0x24) from [<c0323fe8>] (__fimc_md_set_camclk+0x208/0x20c)
[   20.125000] [<c0323fe8>] (__fimc_md_set_camclk+0x208/0x20c) from [<c0324368>] (__fimc_pipeline_close+0x38/0x48)
[   20.135000] [<c0324368>] (__fimc_pipeline_close+0x38/0x48) from [<c0325848>] (fimc_md_link_notify+0x10c/0x198)
[   20.145000] [<c0325848>] (fimc_md_link_notify+0x10c/0x198) from [<c02f9dd4>] (__media_entity_setup_link+0x1c0/0x1e8)
[   20.155000] [<c02f9dd4>] (__media_entity_setup_link+0x1c0/0x1e8) from [<c02f9710>] (media_device_ioctl+0x2c0/0x41c)
[   20.165000] [<c02f9710>] (media_device_ioctl+0x2c0/0x41c) from [<c02f9938>] (media_ioctl+0x30/0x34)
[   20.175000] [<c02f9938>] (media_ioctl+0x30/0x34) from [<c00cf0bc>] (do_vfs_ioctl+0x84/0x5e8)
[   20.185000] [<c00cf0bc>] (do_vfs_ioctl+0x84/0x5e8) from [<c00cf65c>] (sys_ioctl+0x3c/0x60)
[   20.190000] [<c00cf65c>] (sys_ioctl+0x3c/0x60) from [<c000f040>] (ret_fast_syscall+0x0/0x30)

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>

diff --git a/drivers/media/platform/s5p-fimc/fimc-mdevice.c b/drivers/media/platform/s5p-fimc/fimc-mdevice.c
index a17fcb2..cd38d70 100644 (file)
--- a/drivers/media/platform/s5p-fimc/fimc-mdevice.c
+++ b/drivers/media/platform/s5p-fimc/fimc-mdevice.c
@@ -827,7 +827,7 @@ static int fimc_md_link_notify(struct media_pad *source,
        struct fimc_pipeline *pipeline;
        struct v4l2_subdev *sd;
        struct mutex *lock;
-       int ret = 0;
+       int i, ret = 0;
        int ref_count;
 
        if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
@@ -854,29 +854,28 @@ static int fimc_md_link_notify(struct media_pad *source,
                return 0;
        }
 
+       mutex_lock(lock);
+       ref_count = fimc ? fimc->vid_cap.refcnt : fimc_lite->ref_count;
+
        if (!(flags & MEDIA_LNK_FL_ENABLED)) {
-               int i;
-               mutex_lock(lock);
-               ret = __fimc_pipeline_close(pipeline);
+               if (ref_count > 0) {
+                       ret = __fimc_pipeline_close(pipeline);
+                       if (!ret && fimc)
+                               fimc_ctrls_delete(fimc->vid_cap.ctx);
+               }
                for (i = 0; i < IDX_MAX; i++)
                        pipeline->subdevs[i] = NULL;
-               if (fimc)
-                       fimc_ctrls_delete(fimc->vid_cap.ctx);
-               mutex_unlock(lock);
-               return ret;
+       } else if (ref_count > 0) {
+               /*
+                * Link activation. Enable power of pipeline elements only if
+                * the pipeline is already in use, i.e. its video node is open.
+                * Recreate the controls destroyed during the link deactivation.
+                */
+               ret = __fimc_pipeline_open(pipeline,
+                                          source->entity, true);
+               if (!ret && fimc)
+                       ret = fimc_capture_ctrls_create(fimc);
        }
-       /*
-        * Link activation. Enable power of pipeline elements only if the
-        * pipeline is already in use, i.e. its video node is opened.
-        * Recreate the controls destroyed during the link deactivation.
-        */
-       mutex_lock(lock);
-
-       ref_count = fimc ? fimc->vid_cap.refcnt : fimc_lite->ref_count;
-       if (ref_count > 0)
-               ret = __fimc_pipeline_open(pipeline, source->entity, true);
-       if (!ret && fimc)
-               ret = fimc_capture_ctrls_create(fimc);
 
        mutex_unlock(lock);
        return ret ? -EPIPE : ret;