[RESEND PATCH v3 16/32] media: v4l: async: Drop duplicate handling when adding connections

[Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>]

The connections are checked for duplicates already when the notifier is
registered. This is effectively a sanity check for driver (and possibly
obscure firmware) bugs. Don't do this when adding the connection.

Retain the int return type for now. It'll be needed very soon again.

Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
 drivers/media/v4l2-core/v4l2-async.c | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index f51f0c37210c9..5dfc6d5f6a7c3 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -475,8 +475,7 @@ v4l2_async_nf_has_async_match_entry(struct v4l2_async_notifier *notifier,
  */
 static bool
 v4l2_async_nf_has_async_match(struct v4l2_async_notifier *notifier,
-			      struct v4l2_async_match_desc *match,
-			      bool skip_self)
+			      struct v4l2_async_match_desc *match)
 {
 	struct v4l2_async_connection *asc;
 
@@ -484,7 +483,7 @@ v4l2_async_nf_has_async_match(struct v4l2_async_notifier *notifier,
 
 	/* Check that an asd is not being added more than once. */
 	list_for_each_entry(asc, &notifier->asc_list, asc_entry) {
-		if (skip_self && &asc->match == match)
+		if (&asc->match == match)
 			break;
 		if (v4l2_async_match_equal(&asc->match, match))
 			return true;
@@ -499,16 +498,14 @@ v4l2_async_nf_has_async_match(struct v4l2_async_notifier *notifier,
 }
 
 static int v4l2_async_nf_match_valid(struct v4l2_async_notifier *notifier,
-				     struct v4l2_async_match_desc *match,
-				     bool skip_self)
+				     struct v4l2_async_match_desc *match)
 {
 	struct device *dev = notifier_dev(notifier);
 
 	switch (match->type) {
 	case V4L2_ASYNC_MATCH_TYPE_I2C:
 	case V4L2_ASYNC_MATCH_TYPE_FWNODE:
-		if (v4l2_async_nf_has_async_match(notifier, match,
-						  skip_self)) {
+		if (v4l2_async_nf_has_async_match(notifier, match)) {
 			dev_dbg(dev, "v4l2-async: match descriptor already listed in a notifier\n");
 			return -EEXIST;
 		}
@@ -539,7 +536,7 @@ static int __v4l2_async_nf_register(struct v4l2_async_notifier *notifier)
 	mutex_lock(&list_lock);
 
 	list_for_each_entry(asc, &notifier->asc_list, asc_entry) {
-		ret = v4l2_async_nf_match_valid(notifier, &asc->match, true);
+		ret = v4l2_async_nf_match_valid(notifier, &asc->match);
 		if (ret)
 			goto err_unlock;
 
@@ -668,19 +665,13 @@ EXPORT_SYMBOL_GPL(v4l2_async_nf_cleanup);
 static int __v4l2_async_nf_add_connection(struct v4l2_async_notifier *notifier,
 					  struct v4l2_async_connection *asc)
 {
-	int ret;
-
 	mutex_lock(&list_lock);
 
-	ret = v4l2_async_nf_match_valid(notifier, &asc->match, false);
-	if (ret)
-		goto unlock;
-
 	list_add_tail(&asc->asc_entry, &notifier->asc_list);
 
-unlock:
 	mutex_unlock(&list_lock);
-	return ret;
+
+	return 0;
 }
 
 struct v4l2_async_connection *
-- 
2.30.2