Kernel module "bcm2835_isp" is loaded even if camera is off

[ferbar]

Creating a bug report/issue

lsmod shows that several video* kernel modules are loaded even if camera is turned off.
It looks as if bcm2835_isp should be blacklisted, too.

Required Information

• DietPi version | cat /boot/dietpi/.version

G_DIETPI_VERSION_CORE=7
G_DIETPI_VERSION_SUB=0
G_DIETPI_VERSION_RC=2
G_GITBRANCH='master'
G_GITOWNER='MichaIng'

• Distro version | echo $G_DISTRO_NAME or cat /etc/debian_version
10.8

• Kernel version | uname -a
  Linux raspi-99-4651 5.10.17+ DietPi-Config | Minor NTP enhancements #1403 Mon Feb 22 11:26:13 GMT 2021 armv6l GNU/Linux

• SBC model | echo $G_HW_MODEL_NAME or (EG: RPi3)
  RPi A+ (armv6l)

• Power supply used | (EG: 5V 1A RAVpower)
  Battery powered ;-)

• SDcard used | (EG: SanDisk ultra)
  SanDisk 16GB

Additional Information (if applicable)

Steps to reproduce

1. fresh image
2. lsmod

bcm2835_isp            28672  0
bcm2835_mmal_vchiq     28672  1 bcm2835_isp
vc_sm_cma              32768  2 bcm2835_isp,bcm2835_mmal_vchiq
videobuf2_dma_contig    20480  1 bcm2835_isp
videobuf2_memops       16384  1 videobuf2_dma_contig
videobuf2_v4l2         32768  1 bcm2835_isp
videobuf2_common       61440  2 bcm2835_isp,videobuf2_v4l2
videodev              241664  3 bcm2835_isp,videobuf2_common,videobuf2_v4l2

Expected behaviour

no v4l2 kernel modules loaded
bcm2835-isp is built from https://github.com/raspberrypi/linux/tree/rpi-5.10.y/drivers/staging/vc04_services/bcm2835-isp and this code seems to be related v4l2.

Actual behaviour

see "Steps to reproduce"

Extra details

This module probably appeared recently and was not yet added to the blacklist in
https://github.com/MichaIng/DietPi/blob/master/dietpi/func/dietpi-set_hardware#L130

cat /etc/modprobe.d/dietpi-disable_rpi_camera.conf
blacklist bcm2835_codec
blacklist bcm2835_v4l2
blacklist bcm2835_isp

Thanks a lot!

[MichaIng]

Many thanks for your report.

Indeed the automatic loading of non-required kernel modules, despite disabled devices is kinda issue on RPi: raspberrypi/firmware#1141

Good find on this forgotten module, I have it already blacklisted on my personal RPis but forgot to add it to DietPi.

Done with: 422e66f
And patches on next update with: ead4f4a
Changelog: 8decbdb