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SubjectRe: [PATCH 57/78] media: exynos4-is: use pm_runtime_resume_and_get()
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On 24.04.2021 08:45, Mauro Carvalho Chehab wrote:
> Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> added pm_runtime_resume_and_get() in order to automatically handle
> dev->power.usage_count decrement on errors.
>
> Use the new API, in order to cleanup the error check logic.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
> drivers/media/platform/exynos4-is/fimc-capture.c | 6 ++----
> drivers/media/platform/exynos4-is/fimc-is.c | 3 ++-
> drivers/media/platform/exynos4-is/fimc-isp-video.c | 3 +--
> drivers/media/platform/exynos4-is/fimc-isp.c | 7 +++----
> drivers/media/platform/exynos4-is/fimc-lite.c | 5 +++--
> drivers/media/platform/exynos4-is/fimc-m2m.c | 2 +-
> drivers/media/platform/exynos4-is/media-dev.c | 8 +++-----
> drivers/media/platform/exynos4-is/mipi-csis.c | 5 ++---
> 8 files changed, 17 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
> index 13c838d3f947..0da36443173c 100644
> --- a/drivers/media/platform/exynos4-is/fimc-capture.c
> +++ b/drivers/media/platform/exynos4-is/fimc-capture.c
> @@ -478,11 +478,9 @@ static int fimc_capture_open(struct file *file)
> goto unlock;
>
> set_bit(ST_CAPT_BUSY, &fimc->state);
> - ret = pm_runtime_get_sync(&fimc->pdev->dev);
> - if (ret < 0) {
> - pm_runtime_put_sync(&fimc->pdev->dev);
> + ret = pm_runtime_resume_and_get(&fimc->pdev->dev);
> + if (ret < 0)
> goto unlock;
> - }
>
> ret = v4l2_fh_open(file);
> if (ret) {
> diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c
> index 972d9601d236..bca35866cc74 100644
> --- a/drivers/media/platform/exynos4-is/fimc-is.c
> +++ b/drivers/media/platform/exynos4-is/fimc-is.c
> @@ -828,7 +828,7 @@ static int fimc_is_probe(struct platform_device *pdev)
> goto err_irq;
> }
>
> - ret = pm_runtime_get_sync(dev);
> + ret = pm_runtime_resume_and_get(dev);
> if (ret < 0)
> goto err_pm;

It seems you intended to use err_suspend label here. We don't need
a new label though, instead of err_pm we can jump to err_irq when
pm_runtime_resume_and_get() fails. Note that when runtime PM is
disabled pm_runtime_resume_and_get() always returns 0.

> @@ -862,6 +862,7 @@ static int fimc_is_probe(struct platform_device *pdev)
> fimc_is_unregister_subdevs(is);
> err_pm:
> pm_runtime_put_noidle(dev);
> +err_suspend:
> if (!pm_runtime_enabled(dev))
> fimc_is_runtime_suspend(dev);
> err_irq:


> diff --git a/drivers/media/platform/exynos4-is/mipi-csis.c b/drivers/media/platform/exynos4-is/mipi-csis.c
> index 1aac167abb17..a0218237d66b 100644
> --- a/drivers/media/platform/exynos4-is/mipi-csis.c
> +++ b/drivers/media/platform/exynos4-is/mipi-csis.c
> @@ -494,7 +494,7 @@ static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
> struct device *dev = &state->pdev->dev;
>
> if (on)
> - return pm_runtime_get_sync(dev);
> + return pm_runtime_resume_and_get(dev);
>
> return pm_runtime_put_sync(dev);
> }
> @@ -509,9 +509,8 @@ static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
>
> if (enable) {
> s5pcsis_clear_counters(state);
> - ret = pm_runtime_get_sync(&state->pdev->dev);
> + ret = pm_runtime_resume_and_get(&state->pdev->dev);
> if (ret && ret != 1) {
> - pm_runtime_put_noidle(&state->pdev->dev);
> return ret;
> }

Braces could be dropped as well here.

> }


Thanks,
Sylwester

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