Re: [PATCH 18/25] media: mtk-vcodec: fix PM runtime get logic
From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Date: 2021-05-05 12:34:42
Also in:
linux-arm-kernel, linux-media, lkml
On Wed, 5 May 2021 11:42:08 +0200 Mauro Carvalho Chehab [off-list ref] wrote:
Currently, the driver just assumes that PM runtime logic succeded resuming the device. That may not be the case, as pm_runtime_get_sync() can fail (but keeping the usage count incremented). Replace the code to use pm_runtime_resume_and_get(), and letting it return the error code. This way, if mtk_vcodec_dec_pw_on() fails, the logic under fops_vcodec_open() will do the right thing and return an error, instead of just assuming that the device is ready to be used. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
quoted hunk ↗ jump to hunk
--- drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c | 4 +++- drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c | 8 +++++--- drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h | 2 +- 3 files changed, 9 insertions(+), 5 deletions(-)diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c index 147dfef1638d..f87dc47d9e63 100644 --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c@@ -126,7 +126,9 @@ static int fops_vcodec_open(struct file *file) mtk_vcodec_dec_set_default_params(ctx); if (v4l2_fh_is_singular(&ctx->fh)) { - mtk_vcodec_dec_pw_on(&dev->pm); + ret = mtk_vcodec_dec_pw_on(&dev->pm); + if (ret < 0) + goto err_load_fw; /* * Does nothing if firmware was already loaded. */diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c index ddee7046ce42..6038db96f71c 100644 --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c@@ -88,13 +88,15 @@ void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev) put_device(dev->pm.larbvdec); } -void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm) +int mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm) { int ret; - ret = pm_runtime_get_sync(pm->dev); + ret = pm_runtime_resume_and_get(pm->dev); if (ret) - mtk_v4l2_err("pm_runtime_get_sync fail %d", ret); + mtk_v4l2_err("pm_runtime_resume_and_get fail %d", ret); + + return ret; } void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm)diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h index 872d8bf8cfaf..280aeaefdb65 100644 --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h@@ -12,7 +12,7 @@ int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *dev); void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev); -void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm); +int mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm); void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm); void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm); void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm);
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