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Smatch static checker warns that "mdev" can be null:
sound/usb/media.c:287 snd_media_device_create()
warn: 'mdev' can also be NULL
If CONFIG_MEDIA_CONTROLLER is disabled, this file should not be included
in the build.
The below conditions in the sound/usb/Makefile are in place to ensure that
media.c isn't included in the build.
sound/usb/Makefile:
snd-usb-audio-$(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER) += media.o
select SND_USB_AUDIO_USE_MEDIA_CONTROLLER if MEDIA_CONTROLLER &&
(MEDIA_SUPPORT=y || MEDIA_SUPPORT=SND_USB_AUDIO)
The following config check in include/media/media-dev-allocator.h is
in place to enable the API only when CONFIG_MEDIA_CONTROLLER and
CONFIG_USB are enabled.
#if defined(CONFIG_MEDIA_CONTROLLER) && defined(CONFIG_USB)
This check doesn't work as intended when CONFIG_USB=m. When CONFIG_USB=m,
CONFIG_USB_MODULE is defined and CONFIG_USB is not. The above config check
doesn't catch that CONFIG_USB is defined as a module and disables the API.
This results in sound/usb enabling Media Controller specific ALSA driver
code, while Media disables the Media Controller API.
Fix the problem requires two changes:
1. Change the check to use IS_ENABLED to detect when CONFIG_USB is enabled
as a module or static. Since CONFIG_MEDIA_CONTROLLER is a bool, leave
the check unchanged to be consistent with drivers/media/Makefile.
2. Change the drivers/media/mc/Makefile to include mc-dev-allocator.o
in mc-objs when CONFIG_USB is enabled.
Link: https://lore.kernel.org/alsa-devel/YLeAvT+R22FQ%2FEyw@mwanda/
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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| .. | ||
| davinci | ||
| drv-intf | ||
| i2c | ||
| tpg | ||
| cec-notifier.h | ||
| cec-pin.h | ||
| cec.h | ||
| demux.h | ||
| dmxdev.h | ||
| dvb_ca_en50221.h | ||
| dvb_demux.h | ||
| dvb_frontend.h | ||
| dvb_math.h | ||
| dvb_net.h | ||
| dvb_ringbuffer.h | ||
| dvb_vb2.h | ||
| dvb-usb-ids.h | ||
| dvbdev.h | ||
| frame_vector.h | ||
| hevc-ctrls.h | ||
| imx.h | ||
| media-dev-allocator.h | ||
| media-device.h | ||
| media-devnode.h | ||
| media-entity.h | ||
| media-request.h | ||
| rc-core.h | ||
| rc-map.h | ||
| rcar-fcp.h | ||
| tuner-types.h | ||
| tuner.h | ||
| tveeprom.h | ||
| v4l2-async.h | ||
| v4l2-common.h | ||
| v4l2-ctrls.h | ||
| v4l2-dev.h | ||
| v4l2-device.h | ||
| v4l2-dv-timings.h | ||
| v4l2-event.h | ||
| v4l2-fh.h | ||
| v4l2-flash-led-class.h | ||
| v4l2-fwnode.h | ||
| v4l2-h264.h | ||
| v4l2-image-sizes.h | ||
| v4l2-ioctl.h | ||
| v4l2-jpeg.h | ||
| v4l2-mc.h | ||
| v4l2-mediabus.h | ||
| v4l2-mem2mem.h | ||
| v4l2-rect.h | ||
| v4l2-subdev.h | ||
| videobuf2-core.h | ||
| videobuf2-dma-contig.h | ||
| videobuf2-dma-sg.h | ||
| videobuf2-dvb.h | ||
| videobuf2-memops.h | ||
| videobuf2-v4l2.h | ||
| videobuf2-vmalloc.h | ||
| videobuf-core.h | ||
| videobuf-dma-contig.h | ||
| videobuf-dma-sg.h | ||
| videobuf-vmalloc.h | ||
| vsp1.h | ||