[media] v4l2-ctrls: simplify error_idx handling

The lower-level prepare functions just set error_idx for each control that
might have an error. The high-level functions will override this with
cs->count in the get and set cases. Only try will keep the error_idx.

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

1 files changed, 9 insertions, 15 deletions

diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index 3f2a0c5a1c3a..d9e04394c856 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -1450,8 +1450,7 @@ EXPORT_SYMBOL(v4l2_subdev_querymenu);
    Find the controls in the control array and do some basic checks. */
 static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
                              struct v4l2_ext_controls *cs,
-                             struct ctrl_helper *helpers,
-                             bool try)
+                             struct ctrl_helper *helpers)
 {
         u32 i;
 
@@ -1460,8 +1459,7 @@ static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
                 struct v4l2_ctrl *ctrl;
                 u32 id = c->id & V4L2_CTRL_ID_MASK;
 
-                if (try)
-                        cs->error_idx = i;
+                cs->error_idx = i;
 
                 if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
                         return -EINVAL;
@@ -1554,7 +1552,8 @@ int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs
                         return -ENOMEM;
         }
 
-        ret = prepare_ext_ctrls(hdl, cs, helpers, false);
+        ret = prepare_ext_ctrls(hdl, cs, helpers);
+        cs->error_idx = cs->count;
 
         for (i = 0; !ret && i < cs->count; i++)
                 if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
@@ -1701,12 +1700,10 @@ static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
         unsigned i, j;
         int ret = 0;
 
-        cs->error_idx = cs->count;
         for (i = 0; i < cs->count; i++) {
                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
 
-                if (!set)
-                        cs->error_idx = i;
+                cs->error_idx = i;
 
                 if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
                         return -EACCES;
@@ -1724,11 +1721,10 @@ static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
                 struct v4l2_ctrl *ctrl = helpers[i].ctrl;
                 struct v4l2_ctrl *master = ctrl->cluster[0];
 
-                cs->error_idx = i;
-
                 if (helpers[i].handled)
                         continue;
 
+                cs->error_idx = i;
                 v4l2_ctrl_lock(ctrl);
 
                 /* Reset the 'is_new' flags of the cluster */
@@ -1777,12 +1773,11 @@ static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
                 if (!helpers)
                         return -ENOMEM;
         }
-        ret = prepare_ext_ctrls(hdl, cs, helpers, !set);
-        if (ret)
-                goto free;
+        ret = prepare_ext_ctrls(hdl, cs, helpers);
 
         /* First 'try' all controls and abort on error */
-        ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
+        if (!ret)
+                ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
         /* If this is a 'set' operation and the initial 'try' failed,
            then set error_idx to count to tell the application that no
            controls changed value yet. */
@@ -1795,7 +1790,6 @@ static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
                 ret = try_or_set_ext_ctrls(hdl, cs, helpers, true);
         }
 
-free:
         if (cs->count > ARRAY_SIZE(helper))
                 kfree(helpers);
         return ret;