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SubjectRe: [PATCH v3 13/79] media: s5p: fix pm_runtime_get_sync() usage count
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On 27.04.2021 12:26, Mauro Carvalho Chehab wrote:
> The pm_runtime_get_sync() internally increments the
> dev->power.usage_count without decrementing it, even on errors.
> Replace it by the new pm_runtime_resume_and_get(), introduced by:
> commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> in order to properly decrement the usage counter and avoid memory
> leaks.
>
> While here, check if the PM runtime error was caught at
> s5p_cec_adap_enable().
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> drivers/media/cec/platform/s5p/s5p_cec.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/cec/platform/s5p/s5p_cec.c b/drivers/media/cec/platform/s5p/s5p_cec.c
> index 2a3e7ffefe0a..2250c1cbc64e 100644
> --- a/drivers/media/cec/platform/s5p/s5p_cec.c
> +++ b/drivers/media/cec/platform/s5p/s5p_cec.c
> @@ -35,10 +35,13 @@ MODULE_PARM_DESC(debug, "debug level (0-2)");
>
> static int s5p_cec_adap_enable(struct cec_adapter *adap, bool enable)
> {
> + int ret;
> struct s5p_cec_dev *cec = cec_get_drvdata(adap);
>
> if (enable) {
> - pm_runtime_get_sync(cec->dev);
> + ret = pm_runtime_resume_and_get(cec->dev);
> + if (ret < 0)
> + return ret;
>
> s5p_cec_reset(cec);
>

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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