media: v4l: async: Drop duplicate handling when adding connections

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@linux.intel.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de> # imx6qp
Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> # rcar + adv746x
Tested-by: Aishwarya Kothari <aishwarya.kothari@toradex.com> # Apalis i.MX6Q with TC358743
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 0a9c9fb..0cd4e18 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -471,14 +471,11 @@ v4l2_async_nf_has_async_match_entry(struct v4l2_async_notifier *notifier,
 
 /*
  * Find out whether an async sub-device was set up already or whether it exists
- * in a given notifier. The skip_self argument is used to skip testing the same
- * sub-device in the notifier in case the sub-device has been already added to
- * the notifier.
+ * in a given 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;
 
@@ -486,7 +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)
                        continue;
                if (v4l2_async_match_equal(&asc->match, match))
                        return true;
@@ -501,16 +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;
                }
@@ -541,7 +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;
 
@@ -670,19 +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 *