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>
Cc: stable@xxxxxxxxxx
---
Hi Greg,
this one is the backport for 4.8.y. Only hunks and surrounding context lines
shifted slightly, no functional changes compared to its upstream commit
6a676fb69dcbf.
Best
Ralf
drivers/i2c/i2c-core.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index da3a02ef4a..4f8ac45267 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1592,6 +1592,7 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
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(struct i2c_adapter *adap)
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_block *nb, unsigned long action,
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;
--
2.10.2
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