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* [PATCH v5 00/25] media: use pm_runtime_resume_and_get() on non-i2c drivers
@ 2021-05-06 15:25 Mauro Carvalho Chehab
  2021-05-06 15:25 ` [PATCH v5 12/25] media: camss: use pm_runtime_resume_and_get() Mauro Carvalho Chehab
                   ` (3 more replies)
  0 siblings, 4 replies; 11+ messages in thread
From: Mauro Carvalho Chehab @ 2021-05-06 15:25 UTC (permalink / raw)
  Cc: linuxarm, mauro.chehab, Mauro Carvalho Chehab, Alexandre Torgue,
	Andrzej Hajda, Andy Gross, Benoit Parrot, Bingbu Cao,
	Bjorn Andersson, Chen-Yu Tsai, Dafna Hirschfeld, Dan Scally,
	Dmitry Osipenko, Ezequiel Garcia, Fabio Estevam, Heiko Stuebner,
	Helen Koike, Jacob Chen, Jernej Skrabec, Jonathan Hunter,
	Matthias Brugger, Mauro Carvalho Chehab, Maxime Coquelin,
	Maxime Ripard, NXP Linux Team, Paul Kocialkowski,
	Pengutronix Kernel Team, Philipp Zabel, Robert Foss,
	Rui Miguel Silva, Sakari Ailus, Sascha Hauer, Shawn Guo,
	Sowjanya Komatineni, Stanimir Varbanov, Steve Longerbeam,
	Sylwester Nawrocki, Thierry Reding, Tianshu Qiu, Todor Tomov,
	Yong Zhi, linux-arm-kernel, linux-arm-msm, linux-kernel,
	linux-media, linux-mediatek, linux-renesas-soc, linux-rockchip,
	linux-samsung-soc, linux-staging, linux-stm32, linux-sunxi,
	linux-tegra

Dealing with PM runtime (RPM) is different than dealing with other kAPIs used
on media, as most pm_runtime_get_*() functions won't return to the the state
before the call if an error rises. They, instead, increment an usage_count.

Due to that, there were several bugs on media. Just on this review, we found
24 such errors.

So, let's use pm_runtime_resume_and_get() whenever possible, as it
has two advantages over :

1. On errors, it decrements the usage count;
2. It always return zero on success or an error code. This prevents a
   common error pattern of checking if ret is not zero to identify
   for errors.

There are however a few places where calls to pm_runtime_get_sync()
are kept. On several of those, a comment was added, in order to
help preventing trivial patches that could try to change them.

PS.: This series was submitted already together with the fix patches
at:

   	https://lore.kernel.org/linux-media/cover.1619621413.git.mchehab+huawei@kernel.org/

I opted to break it on 3 parts, in order to make easier to review.

This is the third (and final) part.

Mauro Carvalho Chehab (25):
  staging: media: imx7-mipi-csis: use pm_runtime_resume_and_get()
  staging: media: atomisp: use pm_runtime_resume_and_get()
  staging: media: ipu3: use pm_runtime_resume_and_get()
  staging: media: cedrus_video: use pm_runtime_resume_and_get()
  staging: media: tegra-vde: use pm_runtime_resume_and_get()
  staging: media: tegra-video: use pm_runtime_resume_and_get()
  media: rockchip/rga: use pm_runtime_resume_and_get()
  media: sti/hva: use pm_runtime_resume_and_get()
  media: ipu3: use pm_runtime_resume_and_get()
  media: coda: use pm_runtime_resume_and_get()
  media: mtk-jpeg: use pm_runtime_resume_and_get()
  media: camss: use pm_runtime_resume_and_get()
  media: venus: core: use pm_runtime_resume_and_get()
  media: venus: vdec: use pm_runtime_resume_and_get()
  media: venus: venc: use pm_runtime_resume_and_get()
  media: rcar-fcp: use pm_runtime_resume_and_get()
  media: rkisp1: use pm_runtime_resume_and_get()
  media: s3c-camif: use pm_runtime_resume_and_get()
  media: s5p-mfc: use pm_runtime_resume_and_get()
  media: stm32: use pm_runtime_resume_and_get()
  media: sunxi: use pm_runtime_resume_and_get()
  media: ti-vpe: use pm_runtime_resume_and_get()
  media: vsp1: use pm_runtime_resume_and_get()
  media: rcar-vin: use pm_runtime_resume_and_get()
  media: hantro: use pm_runtime_resume_and_get()

 drivers/media/pci/intel/ipu3/ipu3-cio2-main.c |  3 +--
 drivers/media/platform/coda/coda-common.c     |  7 ++++---
 .../media/platform/mtk-jpeg/mtk_jpeg_core.c   |  4 ++--
 .../media/platform/qcom/camss/camss-csid.c    |  6 ++----
 .../media/platform/qcom/camss/camss-csiphy.c  |  6 ++----
 .../media/platform/qcom/camss/camss-ispif.c   |  6 ++----
 drivers/media/platform/qcom/camss/camss-vfe.c |  5 +++--
 .../media/platform/qcom/venus/pm_helpers.c    |  3 +--
 drivers/media/platform/qcom/venus/vdec.c      |  6 +++---
 drivers/media/platform/qcom/venus/venc.c      |  5 +++--
 drivers/media/platform/rcar-fcp.c             |  8 +------
 drivers/media/platform/rcar-vin/rcar-csi2.c   | 15 ++++++++++---
 drivers/media/platform/rcar-vin/rcar-dma.c    |  6 ++----
 drivers/media/platform/rcar-vin/rcar-v4l2.c   |  6 ++----
 drivers/media/platform/rockchip/rga/rga-buf.c |  3 +--
 drivers/media/platform/rockchip/rga/rga.c     |  4 +++-
 .../platform/rockchip/rkisp1/rkisp1-capture.c |  3 +--
 .../media/platform/s3c-camif/camif-capture.c  |  2 +-
 drivers/media/platform/s3c-camif/camif-core.c |  5 +++--
 drivers/media/platform/s5p-mfc/s5p_mfc_pm.c   |  6 ++----
 drivers/media/platform/sti/hva/hva-hw.c       | 17 ++++++++-------
 drivers/media/platform/stm32/stm32-dcmi.c     |  5 +++--
 .../platform/sunxi/sun4i-csi/sun4i_v4l2.c     |  6 ++++--
 drivers/media/platform/ti-vpe/cal-video.c     |  4 +++-
 drivers/media/platform/ti-vpe/cal.c           |  8 ++++---
 drivers/media/platform/ti-vpe/vpe.c           |  8 +++----
 drivers/media/platform/vsp1/vsp1_drv.c        | 10 +--------
 .../staging/media/atomisp/pci/atomisp_fops.c  |  6 +++---
 drivers/staging/media/hantro/hantro_drv.c     |  5 ++---
 drivers/staging/media/imx/imx7-mipi-csis.c    |  7 +++----
 drivers/staging/media/ipu3/ipu3.c             |  3 +--
 .../staging/media/sunxi/cedrus/cedrus_video.c |  6 ++----
 drivers/staging/media/tegra-vde/vde.c         | 21 ++++++++++++++++---
 drivers/staging/media/tegra-video/csi.c       |  3 +--
 drivers/staging/media/tegra-video/vi.c        |  3 +--
 35 files changed, 110 insertions(+), 111 deletions(-)

-- 
2.30.2



^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2021-05-18 15:49 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-06 15:25 [PATCH v5 00/25] media: use pm_runtime_resume_and_get() on non-i2c drivers Mauro Carvalho Chehab
2021-05-06 15:25 ` [PATCH v5 12/25] media: camss: use pm_runtime_resume_and_get() Mauro Carvalho Chehab
2021-05-06 15:25 ` [PATCH v5 13/25] media: venus: core: " Mauro Carvalho Chehab
2021-05-10 13:54   ` Stanimir Varbanov
2021-05-17 15:26     ` Stanimir Varbanov
2021-05-18 15:20       ` Mauro Carvalho Chehab
2021-05-18 15:49         ` Stanimir Varbanov
2021-05-06 15:25 ` [PATCH v5 14/25] media: venus: vdec: " Mauro Carvalho Chehab
2021-05-10 13:55   ` Stanimir Varbanov
2021-05-06 15:25 ` [PATCH v5 15/25] media: venus: venc: " Mauro Carvalho Chehab
2021-05-10 13:55   ` Stanimir Varbanov

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