[media] v4l2: make vidioc_(un)subscribe_event const

Write-only ioctls should have a const argument in the ioctl op.
Do this conversion for vidioc_(un)subscribe_event.
Adding const for write-only ioctls was decided during the 2012 Media Workshop.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

9 files changed, 15 insertions, 15 deletions

diff --git a/drivers/media/pci/ivtv/ivtv-ioctl.c b/drivers/media/pci/ivtv/ivtv-ioctl.c
index d3b32c2d034e..966abb407304 100644
--- a/drivers/media/pci/ivtv/ivtv-ioctl.c
+++ b/drivers/media/pci/ivtv/ivtv-ioctl.c
@@ -1460,7 +1460,7 @@ static int ivtv_overlay(struct file *file, void *fh, unsigned int on)
         return 0;
 }
 
-static int ivtv_subscribe_event(struct v4l2_fh *fh, struct v4l2_event_subscription *sub)
+static int ivtv_subscribe_event(struct v4l2_fh *fh, const struct v4l2_event_subscription *sub)
 {
         switch (sub->type) {
         case V4L2_EVENT_VSYNC:
diff --git a/drivers/media/platform/omap3isp/ispccdc.c b/drivers/media/platform/omap3isp/ispccdc.c
index aa9df9d71a7b..60181ab96063 100644
--- a/drivers/media/platform/omap3isp/ispccdc.c
+++ b/drivers/media/platform/omap3isp/ispccdc.c
@@ -1706,7 +1706,7 @@ static long ccdc_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
 }
 
 static int ccdc_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
-                                struct v4l2_event_subscription *sub)
+                                const struct v4l2_event_subscription *sub)
 {
         if (sub->type != V4L2_EVENT_FRAME_SYNC)
                 return -EINVAL;
@@ -1719,7 +1719,7 @@ static int ccdc_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
 }
 
 static int ccdc_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
-                                  struct v4l2_event_subscription *sub)
+                                  const struct v4l2_event_subscription *sub)
 {
         return v4l2_event_unsubscribe(fh, sub);
 }
diff --git a/drivers/media/platform/omap3isp/ispstat.c b/drivers/media/platform/omap3isp/ispstat.c
index b8640be692f1..d7ac76b5c2ae 100644
--- a/drivers/media/platform/omap3isp/ispstat.c
+++ b/drivers/media/platform/omap3isp/ispstat.c
@@ -1025,7 +1025,7 @@ void omap3isp_stat_dma_isr(struct ispstat *stat)
 
 int omap3isp_stat_subscribe_event(struct v4l2_subdev *subdev,
                                   struct v4l2_fh *fh,
-                                  struct v4l2_event_subscription *sub)
+                                  const struct v4l2_event_subscription *sub)
 {
         struct ispstat *stat = v4l2_get_subdevdata(subdev);
 
@@ -1037,7 +1037,7 @@ int omap3isp_stat_subscribe_event(struct v4l2_subdev *subdev,
 
 int omap3isp_stat_unsubscribe_event(struct v4l2_subdev *subdev,
                                     struct v4l2_fh *fh,
-                                    struct v4l2_event_subscription *sub)
+                                    const struct v4l2_event_subscription *sub)
 {
         return v4l2_event_unsubscribe(fh, sub);
 }
diff --git a/drivers/media/platform/omap3isp/ispstat.h b/drivers/media/platform/omap3isp/ispstat.h
index 9b7c8654dc8a..a6fe653eb237 100644
--- a/drivers/media/platform/omap3isp/ispstat.h
+++ b/drivers/media/platform/omap3isp/ispstat.h
@@ -147,10 +147,10 @@ int omap3isp_stat_init(struct ispstat *stat, const char *name,
 void omap3isp_stat_cleanup(struct ispstat *stat);
 int omap3isp_stat_subscribe_event(struct v4l2_subdev *subdev,
                                   struct v4l2_fh *fh,
-                                  struct v4l2_event_subscription *sub);
+                                  const struct v4l2_event_subscription *sub);
 int omap3isp_stat_unsubscribe_event(struct v4l2_subdev *subdev,
                                     struct v4l2_fh *fh,
-                                    struct v4l2_event_subscription *sub);
+                                    const struct v4l2_event_subscription *sub);
 int omap3isp_stat_s_stream(struct v4l2_subdev *subdev, int enable);
 
 int omap3isp_stat_busy(struct ispstat *stat);
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index ab287f236801..f40003550b60 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2699,7 +2699,7 @@ int v4l2_ctrl_log_status(struct file *file, void *fh)
 EXPORT_SYMBOL(v4l2_ctrl_log_status);
 
 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
-                                struct v4l2_event_subscription *sub)
+                                const struct v4l2_event_subscription *sub)
 {
         if (sub->type == V4L2_EVENT_CTRL)
                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c
index ef2a33c94045..18a040b935a3 100644
--- a/drivers/media/v4l2-core/v4l2-event.c
+++ b/drivers/media/v4l2-core/v4l2-event.c
@@ -203,7 +203,7 @@ int v4l2_event_pending(struct v4l2_fh *fh)
 EXPORT_SYMBOL_GPL(v4l2_event_pending);
 
 int v4l2_event_subscribe(struct v4l2_fh *fh,
-                         struct v4l2_event_subscription *sub, unsigned elems,
+                         const struct v4l2_event_subscription *sub, unsigned elems,
                          const struct v4l2_subscribed_event_ops *ops)
 {
         struct v4l2_subscribed_event *sev, *found_ev;
@@ -278,7 +278,7 @@ void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
 EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe_all);
 
 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
-                           struct v4l2_event_subscription *sub)
+                           const struct v4l2_event_subscription *sub)
 {
         struct v4l2_subscribed_event *sev;
         unsigned long flags;
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 7ef6b27d450f..6890f5e11ad0 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -546,7 +546,7 @@ int v4l2_ctrl_log_status(struct file *file, void *fh);
 /* Can be used as a vidioc_subscribe_event function that just subscribes
    control events. */
 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
-                                struct v4l2_event_subscription *sub);
+                                const struct v4l2_event_subscription *sub);
 
 /* Can be used as a poll function that just polls for control events. */
 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h
index 2885a810a128..e7c5d170a9cd 100644
--- a/include/media/v4l2-event.h
+++ b/include/media/v4l2-event.h
@@ -124,10 +124,10 @@ void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
 void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
 int v4l2_event_pending(struct v4l2_fh *fh);
 int v4l2_event_subscribe(struct v4l2_fh *fh,
-                         struct v4l2_event_subscription *sub, unsigned elems,
+                         const struct v4l2_event_subscription *sub, unsigned elems,
                          const struct v4l2_subscribed_event_ops *ops);
 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
-                           struct v4l2_event_subscription *sub);
+                           const struct v4l2_event_subscription *sub);
 void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
 
 #endif /* V4L2_EVENT_H */
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index 865f95d92ba8..3eef4de0ca33 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -273,9 +273,9 @@ struct v4l2_ioctl_ops {
                                     struct v4l2_dv_timings_cap *cap);
 
         int (*vidioc_subscribe_event)  (struct v4l2_fh *fh,
-                                        struct v4l2_event_subscription *sub);
+                                        const struct v4l2_event_subscription *sub);
         int (*vidioc_unsubscribe_event)(struct v4l2_fh *fh,
-                                        struct v4l2_event_subscription *sub);
+                                        const struct v4l2_event_subscription *sub);
 
         /* For other private ioctls */
         long (*vidioc_default)         (struct file *file, void *fh,