Hi Dinghao,
On Mon, Apr 12, 2021 at 03:31:54PM +0800, Dinghao Liu wrote:
> There is a PM usage counter decrement after zynqmp_qspi_init_hw()
> without any refcount increment, which leads to refcount leak.Add
> a refcount increment to balance the refcount. Also set
> auto_runtime_pm to resume suspended spi controller.
>
> Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
> ---
> changelog:
>
> v2: - Add a refcount increment to fix refcout leak instead of the
> refcount decrement on error.
> Set ctlr->auto_runtime_pm = true.
> ---
> drivers/spi/spi-zynqmp-gqspi.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
> index c8fa6ee18ae7..8b21c7b0e7eb 100644
> --- a/drivers/spi/spi-zynqmp-gqspi.c
> +++ b/drivers/spi/spi-zynqmp-gqspi.c
> @@ -1160,6 +1160,7 @@ static int zynqmp_qspi_probe(struct platform_device
> *pdev)
> pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
> pm_runtime_set_active(&pdev->dev);
> pm_runtime_enable(&pdev->dev);
> + pm_runtime_get_sync(&pdev->dev);
Please check the return value here, if ret is "< 0", goto error label,
and a pm_runtime_put_sync is needed in error label
> /* QSPI controller initializations */
> zynqmp_qspi_init_hw(xqspi);
>
> @@ -1187,6 +1188,7 @@ static int zynqmp_qspi_probe(struct platform_device
> *pdev)
> ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
> SPI_TX_DUAL | SPI_TX_QUAD;
> ctlr->dev.of_node = np;
> + ctlr->auto_runtime_pm = true;
>
> ret = devm_spi_register_controller(&pdev->dev, ctlr);
> if (ret) {
These 2 function
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
are the last operations in probe function since if they runs,
spi_controller will enter suspend state and disable clks after 3s
passing. So please move them just before "return 0".
And would you please cc me when you send V3? I am preparing to send a patch
series
to fix clk and suspend/resume issues which bases on the pm_runtime issue.
Thanks,
Quanyang
> --
> 2.17.1
>
