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media: v4l2-subdev: Guard whole fops and ioctl hdlr

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A sub-device device node can be registered in user space only if the
CONFIG_VIDEO_V4L2_SUBDEV_API Kconfig option is selected. Currently the
open/close file operations and the ioctl handler have some parts of
their implementations guarded by #if
defined(CONFIG_VIDEO_V4L2_SUBDEV_API), while they are actually not
accessible without a video device node registered to user space.

Guard the whole open, close and ioctl handler and provide stubs if the
VIDEO_V4L2_SUBDEV_API Kconfig option is not selected.

This slightly reduces the kernel size when the option is not selected
and simplifies the file ops and ioctl implementations.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Jacopo Mondi 2020-05-07 17:12:51 +02:00 committed by Mauro Carvalho Chehab
parent f75c431e54
commit fb15db8c00
1 changed files with 31 additions and 8 deletions
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39
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -22,24 +22,22 @@
#include <media/v4l2-fh.h> #include <media/v4l2-fh.h>
#include <media/v4l2-event.h> #include <media/v4l2-event.h>
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd) static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{ {
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
if (sd->entity.num_pads) { if (sd->entity.num_pads) {
fh->pad = v4l2_subdev_alloc_pad_config(sd); fh->pad = v4l2_subdev_alloc_pad_config(sd);
if (fh->pad == NULL) if (fh->pad == NULL)
return -ENOMEM; return -ENOMEM;
} }
#endif
return 0; return 0;
} }
static void subdev_fh_free(struct v4l2_subdev_fh *fh) static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{ {
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
v4l2_subdev_free_pad_config(fh->pad); v4l2_subdev_free_pad_config(fh->pad);
fh->pad = NULL; fh->pad = NULL;
#endif
} }
static int subdev_open(struct file *file) static int subdev_open(struct file *file)
@ -111,6 +109,17 @@ static int subdev_close(struct file *file)
return 0; return 0;
} }
#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static int subdev_open(struct file *file)
{
return -ENODEV;
}
static int subdev_close(struct file *file)
{
return -ENODEV;
}
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static inline int check_which(u32 which) static inline int check_which(u32 which)
{ {
@ -324,15 +333,14 @@ const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
}; };
EXPORT_SYMBOL(v4l2_subdev_call_wrappers); EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{ {
struct video_device *vdev = video_devdata(file); struct video_device *vdev = video_devdata(file);
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
struct v4l2_fh *vfh = file->private_data; struct v4l2_fh *vfh = file->private_data;
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags); bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
#endif
int rval; int rval;
switch (cmd) { switch (cmd) {
@ -466,7 +474,6 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
return ret; return ret;
} }
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
case VIDIOC_SUBDEV_G_FMT: { case VIDIOC_SUBDEV_G_FMT: {
struct v4l2_subdev_format *format = arg; struct v4l2_subdev_format *format = arg;
@ -646,7 +653,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
case VIDIOC_SUBDEV_QUERYSTD: case VIDIOC_SUBDEV_QUERYSTD:
return v4l2_subdev_call(sd, video, querystd, arg); return v4l2_subdev_call(sd, video, querystd, arg);
#endif
default: default:
return v4l2_subdev_call(sd, core, ioctl, cmd, arg); return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
} }
@ -686,6 +693,22 @@ static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
} }
#endif #endif
#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static long subdev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
return -ENODEV;
}
#ifdef CONFIG_COMPAT
static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
unsigned long arg)
{
return -ENODEV;
}
#endif
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static __poll_t subdev_poll(struct file *file, poll_table *wait) static __poll_t subdev_poll(struct file *file, poll_table *wait)
{ {
struct video_device *vdev = video_devdata(file); struct video_device *vdev = video_devdata(file);