[PATCH] PCI/pwrctrl: tc9563: take i2c adapter module reference

[PATCH] PCI/pwrctrl: tc9563: take i2c adapter module reference

[Johan Hovold]

The i2c subsystem currently blocks during adapter deregistration
whenever there are consumers holding a reference.

Switch to using of_get_i2c_adapter_by_node() which also takes a
reference to the adapter module so that an attempt to unload the module
while in use fails gracefully instead of blocking uninterruptibly.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c b/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c
index 1555e8a9b3ca..e6a8abd9da8e 100644
--- a/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c
+++ b/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c
@@ -548,7 +548,7 @@ static int tc9563_pwrctrl_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, ret, "Failed to read i2c-parent property\n");
 
 	i2c_node = of_parse_phandle(dev->of_node, "i2c-parent", 0);
-	tc9563->adapter = of_find_i2c_adapter_by_node(i2c_node);
+	tc9563->adapter = of_get_i2c_adapter_by_node(i2c_node);
 	of_node_put(i2c_node);
 	if (!tc9563->adapter)
 		return dev_err_probe(dev, -EPROBE_DEFER, "Failed to find I2C adapter\n");
@@ -556,7 +556,7 @@ static int tc9563_pwrctrl_probe(struct platform_device *pdev)
 	tc9563->client = i2c_new_dummy_device(tc9563->adapter, addr);
 	if (IS_ERR(tc9563->client)) {
 		dev_err(dev, "Failed to create I2C client\n");
-		put_device(&tc9563->adapter->dev);
+		i2c_put_adapter(tc9563->adapter);
 		return PTR_ERR(tc9563->client);
 	}
 
@@ -624,7 +624,7 @@ static int tc9563_pwrctrl_probe(struct platform_device *pdev)
 	tc9563_pwrctrl_power_off(&tc9563->pwrctrl);
 remove_i2c:
 	i2c_unregister_device(tc9563->client);
-	put_device(&tc9563->adapter->dev);
+	i2c_put_adapter(tc9563->adapter);
 	return ret;
 }
 
@@ -636,7 +636,7 @@ static void tc9563_pwrctrl_remove(struct platform_device *pdev)
 
 	tc9563_pwrctrl_power_off(&tc9563->pwrctrl);
 	i2c_unregister_device(tc9563->client);
-	put_device(&tc9563->adapter->dev);
+	i2c_put_adapter(tc9563->adapter);
 }
 
 static const struct of_device_id tc9563_pwrctrl_of_match[] = {
-- 
2.54.0