On 02/08/2025 11:22, Jacopo Mondi wrote:
> From: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
>
> Multiple drivers that use v4l2_fh and call v4l2_fh_del() manually reset
> the file->private_data pointer to NULL in their video device .release()
> file operation handler. Move the code to the v4l2_fh_del() function to
> avoid direct access to file->private_data in drivers. This requires
> adding a file pointer argument to the function.
>
> Changes to drivers have been generated with the following coccinelle
> semantic patch:
>
> @@
> expression fh;
> identifier filp;
> identifier release;
> type ret;
> @@
> ret release(..., struct file *filp, ...)
> {
> <...
> - filp->private_data = NULL;
> ...
> - v4l2_fh_del(fh);
> + v4l2_fh_del(fh, filp);
> ...>
> }
>
> @@
> expression fh;
> identifier filp;
> identifier release;
> type ret;
> @@
> ret release(..., struct file *filp, ...)
> {
> <...
> - v4l2_fh_del(fh);
> + v4l2_fh_del(fh, filp);
> ...
> - filp->private_data = NULL;
> ...>
> }
>
> @@
> expression fh;
> identifier filp;
> identifier release;
> type ret;
> @@
> ret release(..., struct file *filp, ...)
> {
> <...
> - v4l2_fh_del(fh);
> + v4l2_fh_del(fh, filp);
> ...>
> }
>
> Manual changes have been applied to Documentation/ to update the usage
> patterns, to drivers/media/v4l2-core/v4l2-fh.c to update the
> v4l2_fh_del() prototype and reset file->private_data, and to
> include/media/v4l2-fh.h to update the v4l2_fh_del() function prototype
> and its documentation.
>
> Additionally, white space issues have been fixed manually in
> drivers/usb/gadget/function/uvc_v4l2.c
>
> Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo.mo...@ideasonboard.com>
> ---
> Documentation/driver-api/media/v4l2-fh.rst | 4 ++--
> Documentation/translations/zh_CN/video4linux/v4l2-framework.txt | 4 ++--
> drivers/media/pci/cx18/cx18-fileops.c | 4 ++--
> drivers/media/pci/ivtv/ivtv-fileops.c | 4 ++--
> drivers/media/pci/saa7164/saa7164-encoder.c | 2 +-
> drivers/media/pci/saa7164/saa7164-vbi.c | 2 +-
> drivers/media/platform/allegro-dvt/allegro-core.c | 2 +-
> drivers/media/platform/amlogic/meson-ge2d/ge2d.c | 2 +-
> drivers/media/platform/amphion/vpu_v4l2.c | 4 ++--
> drivers/media/platform/chips-media/coda/coda-common.c | 4 ++--
> drivers/media/platform/chips-media/wave5/wave5-helper.c | 2 +-
> drivers/media/platform/imagination/e5010-jpeg-enc.c | 4 ++--
> drivers/media/platform/m2m-deinterlace.c | 2 +-
> drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c | 4 ++--
> drivers/media/platform/mediatek/mdp/mtk_mdp_m2m.c | 4 ++--
> drivers/media/platform/mediatek/mdp3/mtk-mdp3-m2m.c | 4 ++--
> .../media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c | 4 ++--
> .../media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c | 4 ++--
> drivers/media/platform/nvidia/tegra-vde/v4l2.c | 2 +-
> drivers/media/platform/nxp/dw100/dw100.c | 2 +-
> drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c | 4 ++--
> drivers/media/platform/nxp/imx-pxp.c | 2 +-
> drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c | 2 +-
> drivers/media/platform/nxp/mx2_emmaprp.c | 2 +-
> drivers/media/platform/qcom/iris/iris_vidc.c | 3 +--
> drivers/media/platform/qcom/venus/core.c | 2 +-
> drivers/media/platform/renesas/rcar_fdp1.c | 2 +-
> drivers/media/platform/renesas/rcar_jpu.c | 4 ++--
> drivers/media/platform/renesas/vsp1/vsp1_video.c | 2 +-
> drivers/media/platform/rockchip/rga/rga.c | 2 +-
> drivers/media/platform/rockchip/rkvdec/rkvdec.c | 2 +-
> drivers/media/platform/samsung/exynos-gsc/gsc-m2m.c | 4 ++--
> drivers/media/platform/samsung/exynos4-is/fimc-m2m.c | 4 ++--
> drivers/media/platform/samsung/s5p-g2d/g2d.c | 2 +-
> drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c | 4 ++--
> drivers/media/platform/samsung/s5p-mfc/s5p_mfc.c | 4 ++--
> drivers/media/platform/st/sti/bdisp/bdisp-v4l2.c | 4 ++--
> drivers/media/platform/st/sti/delta/delta-v4l2.c | 4 ++--
> drivers/media/platform/st/sti/hva/hva-v4l2.c | 4 ++--
> drivers/media/platform/st/stm32/dma2d/dma2d.c | 2 +-
> drivers/media/platform/sunxi/sun8i-di/sun8i-di.c | 2 +-
> drivers/media/platform/sunxi/sun8i-rotate/sun8i_rotate.c | 2 +-
> drivers/media/platform/ti/omap3isp/ispvideo.c | 5 ++---
> drivers/media/platform/ti/vpe/vpe.c | 2 +-
> drivers/media/platform/verisilicon/hantro_drv.c | 4 ++--
> drivers/media/test-drivers/vicodec/vicodec-core.c | 2 +-
> drivers/media/test-drivers/vim2m.c | 2 +-
> drivers/media/test-drivers/visl/visl-core.c | 2 +-
> drivers/media/usb/pvrusb2/pvrusb2-v4l2.c | 3 +--
> drivers/media/v4l2-core/v4l2-fh.c | 7
> ++++---
> drivers/media/v4l2-core/v4l2-subdev.c | 5 ++---
> drivers/staging/media/imx/imx-media-csc-scaler.c | 4 ++--
> drivers/staging/media/meson/vdec/vdec.c | 2 +-
> drivers/staging/media/sunxi/cedrus/cedrus.c | 2 +-
> drivers/staging/most/video/video.c | 4 ++--
> drivers/usb/gadget/function/uvc_v4l2.c | 3 +--
> include/media/v4l2-fh.h | 5 ++++-
> 57 files changed, 89 insertions(+), 90 deletions(-)
>
<snip>
> diff --git a/drivers/media/v4l2-core/v4l2-fh.c
> b/drivers/media/v4l2-core/v4l2-fh.c
> index
> b59b1084d8cdf1b62da12879e21dbe56c2109648..df3ba9d4674bd25626cfcddc2d0cb28c233e3cc3
> 100644
> --- a/drivers/media/v4l2-core/v4l2-fh.c
> +++ b/drivers/media/v4l2-core/v4l2-fh.c
> @@ -67,7 +67,7 @@ int v4l2_fh_open(struct file *filp)
> }
> EXPORT_SYMBOL_GPL(v4l2_fh_open);
>
> -void v4l2_fh_del(struct v4l2_fh *fh)
> +void v4l2_fh_del(struct v4l2_fh *fh, struct file *filp)
Instead of adding a second argument, perhaps it is better to
just provide the filp pointer. After all, you can get the v4l2_fh
from filp->private_data.
It simplifies the code a bit.
Regards,
Hans
> {
> unsigned long flags;
>
> @@ -75,6 +75,8 @@ void v4l2_fh_del(struct v4l2_fh *fh)
> list_del_init(&fh->list);
> spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
> v4l2_prio_close(fh->vdev->prio, fh->prio);
> +
> + filp->private_data = NULL;
> }
> EXPORT_SYMBOL_GPL(v4l2_fh_del);
>
> @@ -94,10 +96,9 @@ int v4l2_fh_release(struct file *filp)
> struct v4l2_fh *fh = file_to_v4l2_fh(filp);
>
> if (fh) {
> - v4l2_fh_del(fh);
> + v4l2_fh_del(fh, filp);
> v4l2_fh_exit(fh);
> kfree(fh);
> - filp->private_data = NULL;
> }
> return 0;
> }
<snip>
> diff --git a/include/media/v4l2-fh.h b/include/media/v4l2-fh.h
> index
> d8fcf49f10e09452b73499f4a9bd1285bc2835a5..5e4c761635120608e0b588e0b0daf63e69588d38
> 100644
> --- a/include/media/v4l2-fh.h
> +++ b/include/media/v4l2-fh.h
> @@ -114,12 +114,15 @@ int v4l2_fh_open(struct file *filp);
> * v4l2_fh_del - Remove file handle from the list of file handles.
> *
> * @fh: pointer to &struct v4l2_fh
> + * @filp: pointer to &struct file associated with @fh
> + *
> + * The function resets filp->private_data to NULL.
> *
> * .. note::
> * Must be called in v4l2_file_operations->release\(\) handler if the
> driver
> * uses &struct v4l2_fh.
> */
> -void v4l2_fh_del(struct v4l2_fh *fh);
> +void v4l2_fh_del(struct v4l2_fh *fh, struct file *filp);
>
> /**
> * v4l2_fh_exit - Release resources related to a file handle.
>
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