On Thu, Apr 30, 2020 at 05:43:21PM +0200, Alain Volmat wrote:
> 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")
Adding the patch author to CC.
> Signed-off-by: Alain Volmat <alain.volmat@xxxxxx>
> ---
> drivers/i2c/i2c-core-base.c | 22 ++++++++++++++++------
> 1 file changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 139aea351ffb..2e4560671183 100644
> --- 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 @@ static int i2c_device_probe(struct device *dev)
> 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;
> }
>
> --
> 2.17.1
>
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