This series implement Hans's RFC: https://www.spinics.net/lists/linux-media/msg244455.html To summarize Hans's proposal it is needed to distinguish two cases: - the minimal number of buffers to be allocated when calling VIDIOC_REQBUFS. - the minimale number of queued buffers before start streaming. Until now drivers use vb2_queue min_buffers_needed field in the both cases but before introduce delete buffers we need to clarify for which usage each of them use min_buffers_needed field. The branch with all patches is here: https://gitlab.collabora.com/benjamin.gaignard/for-upstream/-/commits/clean_min_need_buffers_v5 I have tested with this command line, I haven't notice issues: ./test-media -kmemleak mc changes in version 5: - Fix the comments done by Hans: Rework comments on videobuf2-core.h Add checks in vb2_core_queue_init(). - Patch test-drivers to use min_reqbufs_allocation field. changes in version 4: - restore removed lines in zoran and vdec drivers. changes in version 3: - Just rename min_buffers_needed into min_queued_buffers everywhere without trying to fix the drivers. - Introduce min_reqbufs_allocation field to be used when calling VIDIOC_REQBUFS. changes in version 2: - change min_buffers_needed into min_queues_buffers instead of min_dma_buffers_needed - patches order - only one patch to rename min_buffers_needed into min_queues_buffer Benjamin Gaignard (3): videobuf2: core: Rename min_buffers_needed field to vb2_queue videobuf2: Add min_reqbufs_allocation field to vb2_queue structure media: test-drivers: Set REQBUFS minimum number of buffers drivers/input/touchscreen/atmel_mxt_ts.c | 2 +- drivers/input/touchscreen/sur40.c | 2 +- drivers/media/common/saa7146/saa7146_fops.c | 2 +- .../media/common/videobuf2/videobuf2-core.c | 34 +++++++++++-------- drivers/media/dvb-core/dvb_vb2.c | 2 +- drivers/media/i2c/video-i2c.c | 2 +- drivers/media/pci/bt8xx/bttv-driver.c | 2 +- drivers/media/pci/cobalt/cobalt-v4l2.c | 2 +- drivers/media/pci/cx18/cx18-streams.c | 2 +- drivers/media/pci/cx23885/cx23885-417.c | 2 +- drivers/media/pci/cx23885/cx23885-dvb.c | 2 +- drivers/media/pci/cx23885/cx23885-video.c | 4 +-- drivers/media/pci/cx25821/cx25821-video.c | 2 +- drivers/media/pci/cx88/cx88-blackbird.c | 2 +- drivers/media/pci/cx88/cx88-dvb.c | 2 +- drivers/media/pci/cx88/cx88-video.c | 4 +-- drivers/media/pci/dt3155/dt3155.c | 2 +- drivers/media/pci/intel/ipu3/ipu3-cio2.c | 2 +- drivers/media/pci/mgb4/mgb4_vin.c | 2 +- drivers/media/pci/mgb4/mgb4_vout.c | 2 +- drivers/media/pci/tw5864/tw5864-video.c | 2 +- drivers/media/pci/tw68/tw68-video.c | 2 +- drivers/media/pci/tw686x/tw686x-video.c | 2 +- drivers/media/pci/zoran/zoran_driver.c | 6 ++-- drivers/media/platform/amphion/vpu_v4l2.c | 4 +-- drivers/media/platform/aspeed/aspeed-video.c | 2 +- drivers/media/platform/atmel/atmel-isi.c | 2 +- .../platform/chips-media/coda/coda-common.c | 2 +- .../platform/microchip/microchip-isc-base.c | 2 +- drivers/media/platform/nuvoton/npcm-video.c | 2 +- drivers/media/platform/nxp/imx7-media-csi.c | 2 +- .../platform/nxp/imx8-isi/imx8-isi-video.c | 2 +- drivers/media/platform/qcom/venus/vdec.c | 4 +-- drivers/media/platform/qcom/venus/venc.c | 4 +-- .../platform/renesas/rcar-vin/rcar-dma.c | 2 +- drivers/media/platform/renesas/renesas-ceu.c | 2 +- .../platform/renesas/rzg2l-cru/rzg2l-video.c | 2 +- drivers/media/platform/renesas/sh_vou.c | 2 +- .../platform/rockchip/rkisp1/rkisp1-capture.c | 2 +- drivers/media/platform/st/sti/hva/hva-v4l2.c | 4 +-- drivers/media/platform/st/stm32/stm32-dcmi.c | 2 +- .../st/stm32/stm32-dcmipp/dcmipp-bytecap.c | 4 +-- .../platform/sunxi/sun4i-csi/sun4i_dma.c | 2 +- .../sunxi/sun6i-csi/sun6i_csi_capture.c | 2 +- .../media/platform/sunxi/sun8i-di/sun8i-di.c | 4 +-- .../sunxi/sun8i-rotate/sun8i_rotate.c | 4 +-- .../media/platform/ti/am437x/am437x-vpfe.c | 2 +- drivers/media/platform/ti/cal/cal-video.c | 2 +- .../media/platform/ti/davinci/vpif_capture.c | 2 +- .../media/platform/ti/davinci/vpif_display.c | 2 +- .../platform/ti/j721e-csi2rx/j721e-csi2rx.c | 2 +- drivers/media/platform/ti/omap/omap_vout.c | 2 +- .../media/test-drivers/vimc/vimc-capture.c | 2 +- drivers/media/test-drivers/vivid/vivid-core.c | 4 +-- drivers/media/usb/cx231xx/cx231xx-417.c | 2 +- drivers/media/usb/cx231xx/cx231xx-video.c | 4 +-- drivers/media/usb/dvb-usb/cxusb-analog.c | 2 +- drivers/media/usb/gspca/gspca.c | 6 ++-- .../media/deprecated/atmel/atmel-isc-base.c | 2 +- drivers/staging/media/imx/imx-media-capture.c | 2 +- drivers/staging/media/ipu3/ipu3-v4l2.c | 2 +- drivers/staging/media/meson/vdec/vdec.c | 6 ++-- .../staging/media/starfive/camss/stf-video.c | 2 +- .../media/sunxi/sun6i-isp/sun6i_isp_capture.c | 2 +- .../media/sunxi/sun6i-isp/sun6i_isp_params.c | 2 +- drivers/staging/media/tegra-video/vi.c | 2 +- include/media/videobuf2-core.h | 20 +++++++++-- samples/v4l/v4l2-pci-skeleton.c | 2 +- 68 files changed, 121 insertions(+), 99 deletions(-) -- 2.40.1
