510 static int uvc_acquire_privileges(struct uvc_fh *handle)  in uvc_acquire_privileges()  argument
512 	/* Always succeed if the handle is already privileged. */  in uvc_acquire_privileges()
513 	if (handle->state == UVC_HANDLE_ACTIVE)  in uvc_acquire_privileges()
516 	/* Check if the device already has a privileged handle. */  in uvc_acquire_privileges()
517 	if (atomic_inc_return(&handle->stream->active) != 1) {  in uvc_acquire_privileges()
518 		atomic_dec(&handle->stream->active);  in uvc_acquire_privileges()
522 	handle->state = UVC_HANDLE_ACTIVE;  in uvc_acquire_privileges()
526 static void uvc_dismiss_privileges(struct uvc_fh *handle)  in uvc_dismiss_privileges()  argument
528 	if (handle->state == UVC_HANDLE_ACTIVE)  in uvc_dismiss_privileges()
529 		atomic_dec(&handle->stream->active);  in uvc_dismiss_privileges()
531 	handle->state = UVC_HANDLE_PASSIVE;  in uvc_dismiss_privileges()
534 static int uvc_has_privileges(struct uvc_fh *handle)  in uvc_has_privileges()  argument
536 	return handle->state == UVC_HANDLE_ACTIVE;  in uvc_has_privileges()
546 	struct uvc_fh *handle;  in uvc_v4l2_open()  local
556 	/* Create the device handle. */  in uvc_v4l2_open()
557 	handle = kzalloc(sizeof(*handle), GFP_KERNEL);  in uvc_v4l2_open()
558 	if (handle == NULL) {  in uvc_v4l2_open()
569 			kfree(handle);  in uvc_v4l2_open()
577 	v4l2_fh_init(&handle->vfh, &stream->vdev);  in uvc_v4l2_open()
578 	v4l2_fh_add(&handle->vfh);  in uvc_v4l2_open()
579 	handle->chain = stream->chain;  in uvc_v4l2_open()
580 	handle->stream = stream;  in uvc_v4l2_open()
581 	handle->state = UVC_HANDLE_PASSIVE;  in uvc_v4l2_open()
582 	file->private_data = handle;  in uvc_v4l2_open()
589 	struct uvc_fh *handle = file->private_data;  in uvc_v4l2_release()  local
590 	struct uvc_streaming *stream = handle->stream;  in uvc_v4l2_release()
594 	/* Only free resources if this is a privileged handle. */  in uvc_v4l2_release()
595 	if (uvc_has_privileges(handle))  in uvc_v4l2_release()
598 	/* Release the file handle. */  in uvc_v4l2_release()
599 	uvc_dismiss_privileges(handle);  in uvc_v4l2_release()
600 	v4l2_fh_del(&handle->vfh);  in uvc_v4l2_release()
601 	v4l2_fh_exit(&handle->vfh);  in uvc_v4l2_release()
602 	kfree(handle);  in uvc_v4l2_release()
618 	struct uvc_fh *handle = file->private_data;  in uvc_ioctl_querycap()  local
619 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_querycap()
620 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_querycap()
658 	struct uvc_fh *handle = fh;  in uvc_ioctl_enum_fmt_vid_cap()  local
659 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_enum_fmt_vid_cap()
667 	struct uvc_fh *handle = fh;  in uvc_ioctl_enum_fmt_vid_out()  local
668 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_enum_fmt_vid_out()
676 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_fmt_vid_cap()  local
677 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_g_fmt_vid_cap()
685 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_fmt_vid_out()  local
686 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_g_fmt_vid_out()
694 	struct uvc_fh *handle = fh;  in uvc_ioctl_s_fmt_vid_cap()  local
695 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_s_fmt_vid_cap()
698 	ret = uvc_acquire_privileges(handle);  in uvc_ioctl_s_fmt_vid_cap()
708 	struct uvc_fh *handle = fh;  in uvc_ioctl_s_fmt_vid_out()  local
709 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_s_fmt_vid_out()
712 	ret = uvc_acquire_privileges(handle);  in uvc_ioctl_s_fmt_vid_out()
722 	struct uvc_fh *handle = fh;  in uvc_ioctl_try_fmt_vid_cap()  local
723 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_try_fmt_vid_cap()
732 	struct uvc_fh *handle = fh;  in uvc_ioctl_try_fmt_vid_out()  local
733 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_try_fmt_vid_out()
742 	struct uvc_fh *handle = fh;  in uvc_ioctl_reqbufs()  local
743 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_reqbufs()
746 	ret = uvc_acquire_privileges(handle);  in uvc_ioctl_reqbufs()
757 		uvc_dismiss_privileges(handle);  in uvc_ioctl_reqbufs()
765 	struct uvc_fh *handle = fh;  in uvc_ioctl_querybuf()  local
766 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_querybuf()
768 	if (!uvc_has_privileges(handle))  in uvc_ioctl_querybuf()
776 	struct uvc_fh *handle = fh;  in uvc_ioctl_qbuf()  local
777 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_qbuf()
779 	if (!uvc_has_privileges(handle))  in uvc_ioctl_qbuf()
789 	struct uvc_fh *handle = fh;  in uvc_ioctl_expbuf()  local
790 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_expbuf()
792 	if (!uvc_has_privileges(handle))  in uvc_ioctl_expbuf()
800 	struct uvc_fh *handle = fh;  in uvc_ioctl_dqbuf()  local
801 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_dqbuf()
803 	if (!uvc_has_privileges(handle))  in uvc_ioctl_dqbuf()
813 	struct uvc_fh *handle = fh;  in uvc_ioctl_create_bufs()  local
814 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_create_bufs()
817 	ret = uvc_acquire_privileges(handle);  in uvc_ioctl_create_bufs()
827 	struct uvc_fh *handle = fh;  in uvc_ioctl_streamon()  local
828 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_streamon()
831 	if (!uvc_has_privileges(handle))  in uvc_ioctl_streamon()
844 	struct uvc_fh *handle = fh;  in uvc_ioctl_streamoff()  local
845 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_streamoff()
847 	if (!uvc_has_privileges(handle))  in uvc_ioctl_streamoff()
860 	struct uvc_fh *handle = fh;  in uvc_ioctl_enum_input()  local
861 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_enum_input()
900 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_input()  local
901 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_g_input()
928 	struct uvc_fh *handle = fh;  in uvc_ioctl_s_input()  local
929 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_s_input()
933 	ret = uvc_acquire_privileges(handle);  in uvc_ioctl_s_input()
963 	struct uvc_fh *handle = fh;  in uvc_ioctl_queryctrl()  local
964 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_queryctrl()
972 	struct uvc_fh *handle = fh;  in uvc_ioctl_query_ext_ctrl()  local
973 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_query_ext_ctrl()
1001 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_ctrl()  local
1002 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_g_ctrl()
1014 	uvc_ctrl_rollback(handle);  in uvc_ioctl_g_ctrl()
1025 	struct uvc_fh *handle = fh;  in uvc_ioctl_s_ctrl()  local
1026 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_s_ctrl()
1038 	ret = uvc_ctrl_set(handle, &xctrl);  in uvc_ioctl_s_ctrl()
1040 		uvc_ctrl_rollback(handle);  in uvc_ioctl_s_ctrl()
1044 	ret = uvc_ctrl_commit(handle, &xctrl, 1);  in uvc_ioctl_s_ctrl()
1055 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_ext_ctrls()  local
1056 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_g_ext_ctrls()
1084 			uvc_ctrl_rollback(handle);  in uvc_ioctl_g_ext_ctrls()
1092 	return uvc_ctrl_rollback(handle);  in uvc_ioctl_g_ext_ctrls()
1095 static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,  in uvc_ioctl_s_try_ext_ctrls()  argument
1100 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_s_try_ext_ctrls()
1113 		ret = uvc_ctrl_set(handle, ctrl);  in uvc_ioctl_s_try_ext_ctrls()
1115 			uvc_ctrl_rollback(handle);  in uvc_ioctl_s_try_ext_ctrls()
1124 		return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);  in uvc_ioctl_s_try_ext_ctrls()
1126 		return uvc_ctrl_rollback(handle);  in uvc_ioctl_s_try_ext_ctrls()
1132 	struct uvc_fh *handle = fh;  in uvc_ioctl_s_ext_ctrls()  local
1134 	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);  in uvc_ioctl_s_ext_ctrls()
1140 	struct uvc_fh *handle = fh;  in uvc_ioctl_try_ext_ctrls()  local
1142 	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);  in uvc_ioctl_try_ext_ctrls()
1148 	struct uvc_fh *handle = fh;  in uvc_ioctl_querymenu()  local
1149 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_querymenu()
1157 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_selection()  local
1158 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_g_selection()
1191 	struct uvc_fh *handle = fh;  in uvc_ioctl_g_parm()  local
1192 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_g_parm()
1200 	struct uvc_fh *handle = fh;  in uvc_ioctl_s_parm()  local
1201 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_s_parm()
1204 	ret = uvc_acquire_privileges(handle);  in uvc_ioctl_s_parm()
1214 	struct uvc_fh *handle = fh;  in uvc_ioctl_enum_framesizes()  local
1215 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_enum_framesizes()
1254 	struct uvc_fh *handle = fh;  in uvc_ioctl_enum_frameintervals()  local
1255 	struct uvc_streaming *stream = handle->stream;  in uvc_ioctl_enum_frameintervals()
1326 	struct uvc_fh *handle = fh;  in uvc_ioctl_default()  local
1327 	struct uvc_video_chain *chain = handle->chain;  in uvc_ioctl_default()
1432 	struct uvc_fh *handle = file->private_data;  in uvc_v4l2_compat_ioctl32()  local
1445 		ret = uvc_ioctl_ctrl_map(handle->chain, &karg.xmap);  in uvc_v4l2_compat_ioctl32()
1458 		ret = uvc_xu_ctrl_query(handle->chain, &karg.xqry);  in uvc_v4l2_compat_ioctl32()
1477 	struct uvc_fh *handle = file->private_data;  in uvc_v4l2_read()  local
1478 	struct uvc_streaming *stream = handle->stream;  in uvc_v4l2_read()
1486 	struct uvc_fh *handle = file->private_data;  in uvc_v4l2_mmap()  local
1487 	struct uvc_streaming *stream = handle->stream;  in uvc_v4l2_mmap()
1496 	struct uvc_fh *handle = file->private_data;  in uvc_v4l2_poll()  local
1497 	struct uvc_streaming *stream = handle->stream;  in uvc_v4l2_poll()
1509 	struct uvc_fh *handle = file->private_data;  in uvc_v4l2_get_unmapped_area()  local
1510 	struct uvc_streaming *stream = handle->stream;  in uvc_v4l2_get_unmapped_area()