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* [PATCH AUTOSEL 5.4 69/73] i2c: acpi: put device when verifying client fails
       [not found] <20200318205337.16279-1-sashal@kernel.org>
@ 2020-03-18 20:53 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2020-03-18 20:53 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Wolfram Sang, Geert Uytterhoeven, Andy Shevchenko,
	Mika Westerberg, Wolfram Sang, Sasha Levin, linux-i2c,
	linux-acpi

From: Wolfram Sang <wsa+renesas@sang-engineering.com>

[ Upstream commit 8daee952b4389729358665fb91949460641659d4 ]

i2c_verify_client() can fail, so we need to put the device when that
happens.

Fixes: 525e6fabeae2 ("i2c / ACPI: add support for ACPI reconfigure notifications")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/i2c/i2c-core-acpi.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 62a1c92ab803d..ce70b5288472c 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -394,9 +394,17 @@ EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
 {
 	struct device *dev;
+	struct i2c_client *client;
 
 	dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
-	return dev ? i2c_verify_client(dev) : NULL;
+	if (!dev)
+		return NULL;
+
+	client = i2c_verify_client(dev);
+	if (!client)
+		put_device(dev);
+
+	return client;
 }
 
 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
-- 
2.20.1


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2020-03-18 20:53 ` [PATCH AUTOSEL 5.4 69/73] i2c: acpi: put device when verifying client fails Sasha Levin

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