Hi Dinghao,
Thanks for the patch. Indeed, this should be fixed.
Overall, there are several other calls to pm_runtime_get_sync within this
driver, would you like to fix them all at once ?
On Thu, May 21, 2020 at 03:05:07PM +0800, Dinghao Liu wrote:
> pm_runtime_get_sync() increments the runtime PM usage counter even
> the call returns an error code. Thus a pairing decrement is needed
> on the error handling path to keep the counter balanced.
>
> Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-stm32f7.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> index 330ffed011e0..602cf35649c8 100644
> --- a/drivers/i2c/busses/i2c-stm32f7.c
> +++ b/drivers/i2c/busses/i2c-stm32f7.c
> @@ -1767,8 +1767,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
> return ret;
>
> ret = pm_runtime_get_sync(dev);
> - if (ret < 0)
> + if (ret < 0) {
> + pm_runtime_put_autosuspend(dev);
Considering that if we fail here there is a very good chance that this is due
to the resume failing, pm_runtime_put_noidle would probably make more sense
since pm_runtime_put_autosuspend will most probably fail as well.
> return ret;
> + }
>
> if (!stm32f7_i2c_is_slave_registered(i2c_dev))
> stm32f7_i2c_enable_wakeup(i2c_dev, true);
> --
> 2.17.1
>
