linux-kernel - [PATCH 0/2] Add some uevent variables on DVB to support persistent names on udev

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Message-ID: <cover.1708422122.git.mchehab@kernel.org>
Date: Tue, 20 Feb 2024 10:46:00 +0100
From: Mauro Carvalho Chehab <mchehab@...nel.org>
To: 
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: [PATCH 0/2] Add some uevent variables on DVB to support persistent names on udev

As pointed by https://github.com/systemd/systemd/issues/31406,
currently, udev doesn't have pesistent names for the subsystem.

Add adapter's name and device's parent device, as those may help
adding unique persistent names.

While here, also change em28xx-dvb to use a real name instead of
the parent dev name. With that,  uevent for DVB devnodes will
resemble this:

/sys/class/dvb/dvb0.demux0/uevent:MAJOR=212
/sys/class/dvb/dvb0.demux0/uevent:MINOR=1
/sys/class/dvb/dvb0.demux0/uevent:DEVNAME=dvb/adapter0/demux0
/sys/class/dvb/dvb0.demux0/uevent:DVB_ADAPTER_NAME=PCTV nanoStick T2 290e
/sys/class/dvb/dvb0.demux0/uevent:DVB_ADAPTER_PDEV=2-1:1.0
/sys/class/dvb/dvb0.demux0/uevent:DVB_ADAPTER_NUM=0
/sys/class/dvb/dvb0.demux0/uevent:DVB_DEVICE_TYPE=demux
/sys/class/dvb/dvb0.demux0/uevent:DVB_DEVICE_NUM=0

Tested with a PCTV nanoStick T2 290e device.

Mauro Carvalho Chehab (2):
  media: dvbdev: export adapter's name and bus ID to DVB uevent
    variables
  em28xx-dvb: fix DVB adapter device name

 drivers/media/dvb-core/dvbdev.c       | 2 ++
 drivers/media/usb/em28xx/em28xx-dvb.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

-- 
2.43.0