[PATCH 06/18] media: v4l: async: Only pass match information for async subdev validation

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Pass only information required for sub-device matching to functions
checking whether the async sub-device already exists. Do the same for
debug message printing. This makes further changes to other aspects of
async sub-devices easier.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/v4l2-core/v4l2-async.c | 93 ++++++++++++++--------------
 1 file changed, 46 insertions(+), 47 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index fc9ae22e2b47..224ebf50f2d0 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -62,14 +62,14 @@ static void v4l2_async_nf_call_destroy(struct v4l2_async_notifier *n,
 }
 
 static bool match_i2c(struct v4l2_async_notifier *notifier,
-		      struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
+		      struct v4l2_subdev *sd, struct v4l2_async_match *match)
 {
 #if IS_ENABLED(CONFIG_I2C)
 	struct i2c_client *client = i2c_verify_client(sd->dev);
 
 	return client &&
-		asd->match.i2c.adapter_id == client->adapter->nr &&
-		asd->match.i2c.address == client->addr;
+		match->i2c.adapter_id == client->adapter->nr &&
+		match->i2c.address == client->addr;
 #else
 	return false;
 #endif
@@ -84,26 +84,26 @@ static struct device *notifier_dev(struct v4l2_async_notifier *notifier)
 static bool
 match_fwnode_one(struct v4l2_async_notifier *notifier,
 		 struct v4l2_subdev *sd, struct fwnode_handle *sd_fwnode,
-		 struct v4l2_async_subdev *asd)
+		 struct v4l2_async_match *match)
 {
 	struct fwnode_handle *asd_dev_fwnode;
 	bool ret;
 
 	dev_dbg(sd->dev, "async: fwnode match: need %pfw, trying %pfw\n",
-		sd_fwnode, asd->match.fwnode);
+		sd_fwnode, match->fwnode);
 
-	if (sd_fwnode == asd->match.fwnode) {
+	if (sd_fwnode == match->fwnode) {
 		dev_dbg(sd->dev, "async: direct match found\n");
 		return true;
 	}
 
-	if (!fwnode_graph_is_endpoint(asd->match.fwnode)) {
+	if (!fwnode_graph_is_endpoint(match->fwnode)) {
 		dev_dbg(sd->dev,
 			"async: async subdev fwnode not endpoint, no match\n");
 		return false;
 	}
 
-	asd_dev_fwnode = fwnode_graph_get_port_parent(asd->match.fwnode);
+	asd_dev_fwnode = fwnode_graph_get_port_parent(match->fwnode);
 
 	ret = sd_fwnode == asd_dev_fwnode;
 
@@ -116,12 +116,12 @@ match_fwnode_one(struct v4l2_async_notifier *notifier,
 }
 
 static bool match_fwnode(struct v4l2_async_notifier *notifier,
-			 struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
+			 struct v4l2_subdev *sd, struct v4l2_async_match *match)
 {
 	dev_dbg(sd->dev, "async: matching for notifier %pfw, sd %pfw\n",
 		dev_fwnode(notifier_dev(notifier)), sd->fwnode);
 
-	if (match_fwnode_one(notifier, sd, sd->fwnode, asd))
+	if (match_fwnode_one(notifier, sd, sd->fwnode, match))
 		return true;
 
 	/* Also check the secondary fwnode. */
@@ -130,7 +130,7 @@ static bool match_fwnode(struct v4l2_async_notifier *notifier,
 
 	dev_dbg(sd->dev, "async: trying secondary fwnode match\n");
 
-	return match_fwnode_one(notifier, sd, sd->fwnode->secondary, asd);
+	return match_fwnode_one(notifier, sd, sd->fwnode->secondary, match);
 }
 
 static LIST_HEAD(subdev_list);
@@ -142,7 +142,7 @@ v4l2_async_find_match(struct v4l2_async_notifier *notifier,
 		      struct v4l2_subdev *sd)
 {
 	bool (*match)(struct v4l2_async_notifier *notifier,
-		      struct v4l2_subdev *sd, struct v4l2_async_subdev *asd);
+		      struct v4l2_subdev *sd, struct v4l2_async_match *match);
 	struct v4l2_async_subdev *asd;
 
 	list_for_each_entry(asd, &notifier->waiting, list) {
@@ -161,7 +161,7 @@ v4l2_async_find_match(struct v4l2_async_notifier *notifier,
 		}
 
 		/* match cannot be NULL here */
-		if (match(notifier, sd, asd))
+		if (match(notifier, sd, &asd->match))
 			return asd;
 	}
 
@@ -169,20 +169,18 @@ v4l2_async_find_match(struct v4l2_async_notifier *notifier,
 }
 
 /* Compare two async sub-device descriptors for equivalence */
-static bool asd_equal(struct v4l2_async_subdev *asd_x,
-		      struct v4l2_async_subdev *asd_y)
+static bool asd_equal(struct v4l2_async_match *match1,
+		      struct v4l2_async_match *match2)
 {
-	if (asd_x->match.type != asd_y->match.type)
+	if (match1->type != match2->type)
 		return false;
 
-	switch (asd_x->match.type) {
+	switch (match1->type) {
 	case V4L2_ASYNC_MATCH_I2C:
-		return asd_x->match.i2c.adapter_id ==
-			asd_y->match.i2c.adapter_id &&
-			asd_x->match.i2c.address ==
-			asd_y->match.i2c.address;
+		return match1->i2c.adapter_id == match2->i2c.adapter_id &&
+			match1->i2c.address == match2->i2c.address;
 	case V4L2_ASYNC_MATCH_FWNODE:
-		return asd_x->match.fwnode == asd_y->match.fwnode;
+		return match1->fwnode == match2->fwnode;
 	default:
 		break;
 	}
@@ -434,20 +432,20 @@ v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier,
 /* See if an async sub-device can be found in a notifier's lists. */
 static bool
 __v4l2_async_nf_has_async_subdev(struct v4l2_async_notifier *notifier,
-				 struct v4l2_async_subdev *asd)
+				 struct v4l2_async_match *match)
 {
-	struct v4l2_async_subdev *asd_y;
+	struct v4l2_async_subdev *asd;
 	struct v4l2_subdev *sd;
 
-	list_for_each_entry(asd_y, &notifier->waiting, list)
-		if (asd_equal(asd, asd_y))
+	list_for_each_entry(asd, &notifier->waiting, list)
+		if (asd_equal(&asd->match, match))
 			return true;
 
 	list_for_each_entry(sd, &notifier->done, async_list) {
 		if (WARN_ON(!sd->asd))
 			continue;
 
-		if (asd_equal(asd, sd->asd))
+		if (asd_equal(&sd->asd->match, match))
 			return true;
 	}
 
@@ -460,49 +458,50 @@ __v4l2_async_nf_has_async_subdev(struct v4l2_async_notifier *notifier,
  */
 static bool
 v4l2_async_nf_has_async_subdev(struct v4l2_async_notifier *notifier,
-			       struct v4l2_async_subdev *asd, bool skip_self)
+			       struct v4l2_async_match *match, bool skip_self)
 {
-	struct v4l2_async_subdev *asd_y;
+	struct v4l2_async_subdev *asd;
 
 	lockdep_assert_held(&list_lock);
 
 	/* Check that an asd is not being added more than once. */
-	list_for_each_entry(asd_y, &notifier->asd_list, asd_list) {
-		if (asd == asd_y)
+	list_for_each_entry(asd, &notifier->asd_list, asd_list) {
+		if (&asd->match == match)
 			break;
-		if (asd_equal(asd, asd_y))
+		if (asd_equal(&asd->match, match))
 			return true;
 	}
 
 	/* Check that an asd does not exist in other notifiers. */
 	list_for_each_entry(notifier, &notifier_list, list)
-		if (__v4l2_async_nf_has_async_subdev(notifier, asd))
+		if (__v4l2_async_nf_has_async_subdev(notifier, match))
 			return true;
 
 	return false;
 }
 
 static int v4l2_async_nf_asd_valid(struct v4l2_async_notifier *notifier,
-				   struct v4l2_async_subdev *asd,
+				   struct v4l2_async_match *match,
 				   bool skip_self)
 {
 	struct device *dev =
 		notifier->v4l2_dev ? notifier->v4l2_dev->dev : NULL;
 
-	if (!asd)
+	if (!match)
 		return -EINVAL;
 
-	switch (asd->match.type) {
+	switch (match->type) {
 	case V4L2_ASYNC_MATCH_I2C:
 	case V4L2_ASYNC_MATCH_FWNODE:
-		if (v4l2_async_nf_has_async_subdev(notifier, asd, skip_self)) {
+		if (v4l2_async_nf_has_async_subdev(notifier, match,
+						   skip_self)) {
 			dev_dbg(dev, "subdev descriptor already listed in this or other notifiers\n");
 			return -EEXIST;
 		}
 		break;
 	default:
-		dev_err(dev, "Invalid match type %u on %p\n",
-			asd->match.type, asd);
+		dev_err(dev, "Invalid match type %u on %p\n", match->type,
+			match);
 		return -EINVAL;
 	}
 
@@ -526,7 +525,7 @@ static int __v4l2_async_nf_register(struct v4l2_async_notifier *notifier)
 	mutex_lock(&list_lock);
 
 	list_for_each_entry(asd, &notifier->asd_list, asd_list) {
-		ret = v4l2_async_nf_asd_valid(notifier, asd, true);
+		ret = v4l2_async_nf_asd_valid(notifier, &asd->match, true);
 		if (ret)
 			goto err_unlock;
 
@@ -659,7 +658,7 @@ int __v4l2_async_nf_add_subdev(struct v4l2_async_notifier *notifier,
 
 	mutex_lock(&list_lock);
 
-	ret = v4l2_async_nf_asd_valid(notifier, asd, false);
+	ret = v4l2_async_nf_asd_valid(notifier, &asd->match, false);
 	if (ret)
 		goto unlock;
 
@@ -846,15 +845,15 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
 EXPORT_SYMBOL(v4l2_async_unregister_subdev);
 
 static void print_waiting_subdev(struct seq_file *s,
-				 struct v4l2_async_subdev *asd)
+				 struct v4l2_async_match *match)
 {
-	switch (asd->match.type) {
+	switch (match->type) {
 	case V4L2_ASYNC_MATCH_I2C:
-		seq_printf(s, " [i2c] dev=%d-%04x\n", asd->match.i2c.adapter_id,
-			   asd->match.i2c.address);
+		seq_printf(s, " [i2c] dev=%d-%04x\n", match->i2c.adapter_id,
+			   match->i2c.address);
 		break;
 	case V4L2_ASYNC_MATCH_FWNODE: {
-		struct fwnode_handle *devnode, *fwnode = asd->match.fwnode;
+		struct fwnode_handle *devnode, *fwnode = match->fwnode;
 
 		devnode = fwnode_graph_is_endpoint(fwnode) ?
 			  fwnode_graph_get_port_parent(fwnode) :
@@ -891,7 +890,7 @@ static int pending_subdevs_show(struct seq_file *s, void *data)
 	list_for_each_entry(notif, &notifier_list, list) {
 		seq_printf(s, "%s:\n", v4l2_async_nf_name(notif));
 		list_for_each_entry(asd, &notif->waiting, list)
-			print_waiting_subdev(s, asd);
+			print_waiting_subdev(s, &asd->match);
 	}
 
 	mutex_unlock(&list_lock);
-- 
2.30.2