[PATCH 4.8 121/138] i2c: mark device nodes only in case of successful instantiation

[Greg Kroah-Hartman]

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ralf Ramsauer <ralf@xxxxxxxxxxxxxxxxxxxxxx>

commit 6a676fb69dcbf3310b9e462c1db66c8e7f6ead38 upstream.

Instantiated I2C device nodes are marked with OF_POPULATE. This was
introduced in 4f001fd30145a6. On unloading, loaded device nodes will of
course be unmarked. The problem are nodes that fail during
initialisation: If a node fails, it won't be unloaded and hence not be
unmarked.

If a I2C driver module is unloaded and reloaded, it will skip nodes that
failed before.

Skip device nodes that are already populated and mark them only in case
of success.

Fixes: 4f001fd30145a6 ("i2c: Mark instantiated device nodes with OF_POPULATE")
Signed-off-by: Ralf Ramsauer <ralf@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Acked-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
[wsa: use 14-digit commit sha]
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>


---
 drivers/i2c/i2c-core.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1592,6 +1592,7 @@ static struct i2c_client *of_i2c_registe
 static void of_i2c_register_devices(struct i2c_adapter *adap)
 {
 	struct device_node *node;
+	struct i2c_client *client;
 
 	/* Only register child devices if the adapter has a node pointer set */
 	if (!adap->dev.of_node)
@@ -1602,7 +1603,14 @@ static void of_i2c_register_devices(stru
 	for_each_available_child_of_node(adap->dev.of_node, node) {
 		if (of_node_test_and_set_flag(node, OF_POPULATED))
 			continue;
-		of_i2c_register_device(adap, node);
+
+		client = of_i2c_register_device(adap, node);
+		if (IS_ERR(client)) {
+			dev_warn(&adap->dev,
+				 "Failed to create I2C device for %s\n",
+				 node->full_name);
+			of_node_clear_flag(node, OF_POPULATED);
+		}
 	}
 }
 
@@ -2201,6 +2209,7 @@ static int of_i2c_notify(struct notifier
 		if (IS_ERR(client)) {
 			dev_err(&adap->dev, "failed to create client for '%s'\n",
 				 rd->dn->full_name);
+			of_node_clear_flag(rd->dn, OF_POPULATED);
 			return notifier_from_errno(PTR_ERR(client));
 		}
 		break;