[Linux-stm32] [PATCH] spi: stm32-qspi: fix reference leak in stm32 qspi operations

[Patrice CHOTARD]

Hi Zhang

On 11/6/20 2:53 AM, Zhang Qilong wrote:
> pm_runtime_get_sync will increment pm usage counter even it
> failed. Forgetting to pm_runtime_put_noidle will result in
> reference leak in two callers(stm32_qspi_exec_op and
> stm32_qspi_setup), so we should fix it.
>
> Fixes: 9d282c17b023a ("spi: stm32-qspi: Add pm_runtime support")
> Signed-off-by: Zhang Qilong <zhangqilong3 at huawei.com>
> ---
>  drivers/spi/spi-stm32-qspi.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
> index a900962b4336..947e6b9dc9f4 100644
> --- a/drivers/spi/spi-stm32-qspi.c
> +++ b/drivers/spi/spi-stm32-qspi.c
> @@ -434,8 +434,10 @@ static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
>  	int ret;
>  
>  	ret = pm_runtime_get_sync(qspi->dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(qspi->dev);
>  		return ret;
> +	}
>  
>  	mutex_lock(&qspi->lock);
>  	ret = stm32_qspi_send(mem, op);
> @@ -462,8 +464,10 @@ static int stm32_qspi_setup(struct spi_device *spi)
>  		return -EINVAL;
>  
>  	ret = pm_runtime_get_sync(qspi->dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(qspi->dev);
>  		return ret;
> +	}
>  
>  	presc = DIV_ROUND_UP(qspi->clk_rate, spi->max_speed_hz) - 1;
>  

Reviewed-by: Patrice Chotard <patrice.chotard at st.com>

Thanks