i2c: fix missing pm_runtime_put_sync in i2c_device_probe

In case of the I2C client exposes the flag I2C_CLIENT_HOST_NOTIFY,
pm_runtime_get_sync is called in order to always keep active the
adapter. However later on, pm_runtime_put_sync is never called
within the function in case of an error. This commit add this
error handling.

Fixes: 72bfcee11cf8 ("i2c: Prevent runtime suspend of adapter when Host Notify is required")
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index a669127..b0de307 100644 (file)
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -338,8 +338,10 @@ static int i2c_device_probe(struct device *dev)
                } else if (ACPI_COMPANION(dev)) {
                        irq = i2c_acpi_get_irq(client);
                }
-               if (irq == -EPROBE_DEFER)
-                       return irq;
+               if (irq == -EPROBE_DEFER) {
+                       status = irq;
+                       goto put_sync_adapter;
+               }
 
                if (irq < 0)
                        irq = 0;
@@ -353,15 +355,19 @@ static int i2c_device_probe(struct device *dev)
         */
        if (!driver->id_table &&
            !i2c_acpi_match_device(dev->driver->acpi_match_table, client) &&
-           !i2c_of_match_device(dev->driver->of_match_table, client))
-               return -ENODEV;
+           !i2c_of_match_device(dev->driver->of_match_table, client)) {
+               status = -ENODEV;
+               goto put_sync_adapter;
+       }
 
        if (client->flags & I2C_CLIENT_WAKE) {
                int wakeirq;
 
                wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
-               if (wakeirq == -EPROBE_DEFER)
-                       return wakeirq;
+               if (wakeirq == -EPROBE_DEFER) {
+                       status = wakeirq;
+                       goto put_sync_adapter;
+               }
 
                device_init_wakeup(&client->dev, true);
 
@@ -408,6 +414,10 @@ err_detach_pm_domain:
 err_clear_wakeup_irq:
        dev_pm_clear_wake_irq(&client->dev);
        device_init_wakeup(&client->dev, false);
+put_sync_adapter:
+       if (client->flags & I2C_CLIENT_HOST_NOTIFY)
+               pm_runtime_put_sync(&client->adapter->dev);
+
        return status;
 }