linux/drivers/isdn
Paul Bolle d1cadce15a isdn/capi: fix (middleware) device nodes
Since v2.4 the capi driver used the following device nodes if
"middleware" support was enabled:
    /dev/capi20
    /dev/capi/0
    /dev/capi/1
    [...]

/dev/capi20 is a character device node. /dev/capi/0 (and up) are tty
device nodes (with a different major).

This device node (naming) scheme is not documented anywhere, as far as I
know. It was originally provided by the capifs pseudo filesystem (before
udev became available). It is required for example by the pppd
capiplugin. It was supported until a few years ago. But a number of
developments broke it:
- v2.6.6 (May 2004) renamed /dev/capi20 to /dev/capi and removed the
  "/" from the name of capi's tty driver. The explanation of the patch
  that did this included two examples of udev rules "to restore the old
  namespace";
- either udev 154 (May 2010) or udev 179 (January 2012) stopped
  allowing to rename device nodes, and thus the ability to have
  /dev/capi20 appear instead of /dev/capi and /dev/capi/0 (and up)
  instead of /dev/capi0 (and up);
- v3.0 (July 2011) also removed capifs. That disabled another method to
  create the /dev/capi/0 (and up) device nodes.

So now users need to manually tweak their setup (eg, create /dev/capi/
and fill that with symlinks) to get things working. This is all rather
hacky and only discoverable by searching the web. Fix all this by
renaming /dev/capi back to /dev/capi20, and by setting the name of the
"capi_nc" tty driver to "capi!" so the tty device nodes appear as
/dev/capi/0 (and up).

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-06-04 23:13:41 -07:00
..
act2000 isdn: replace del_timer by del_timer_sync 2014-03-27 15:28:06 -04:00
capi isdn/capi: fix (middleware) device nodes 2014-06-04 23:13:41 -07:00
divert isdn: divert, hysdn: fix interruptible_sleep_on race 2014-02-26 16:06:13 -05:00
gigaset Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
hardware isdn: remove deprecated IRQF_DISABLED 2013-10-17 15:13:20 -04:00
hisax isdn: hisax: remove some dead code 2014-05-07 15:44:24 -04:00
hysdn isdn: divert, hysdn: fix interruptible_sleep_on race 2014-02-26 16:06:13 -05:00
i4l net: filter: let unattached filters use sock_fprog_kern 2014-05-23 16:48:05 -04:00
icn isdn: icn: buffer overflow in icn_command() 2014-04-16 15:24:15 -04:00
isdnloop isdnloop: several buffer overflows 2014-04-08 12:41:13 -04:00
mISDN mISDN: Use mod_timer() 2014-05-22 15:50:12 -04:00
pcbit isdn: pcbit: fix interruptible_sleep_on race 2014-02-26 16:06:12 -05:00
sc isdn: replace del_timer by del_timer_sync 2014-03-27 15:28:06 -04:00
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