linux-kernel - RV: ppdev - libieee1284.so conflicts with 2.6.2{0,1,2}

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Message-Id: <1187090150.24874.45.camel@jonsy.dit.upm.es>
Date:	Tue, 14 Aug 2007 13:15:50 +0200
From:	Jonsito <jonsito@...eline.es>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Adrian Bunk <bunk@...sta.de>
Subject: RV: ppdev - libieee1284.so  conflicts with 2.6.2{0,1,2}

El mié, 04-07-2007 a las 13:58 +0200, Jonsito escribió:
[...]

from libieee1284 bug tracker:
http://sourceforge.net/tracker/index.php?func=detail&aid=1739643&group_id=29314&atid=395778

---------------------------
/proc on on 2.6.22.1 

# ls -la /proc/sys/dev/parport
total 0
dr-xr-xr-x 0 root root 0 2007-08-03 08:21 .
dr-xr-xr-x 0 root root 0 2007-08-03 08:19 ..
dr-xr-xr-x 0 root root 0 2007-08-03 08:25 default
dr-xr-xr-x 0 root root 0 2007-08-03 08:25 parport0

on 2.6.18
# ls -la /proc/sys/dev/parport/
total 0
dr-xr-xr-x 4 root root 0 Aug  3 08:29 .
dr-xr-xr-x 7 root root 0 Aug  3 08:29 ..
dr-xr-xr-x 2 root root 0 Aug  3 08:29 default
dr-xr-xr-x 3 root root 0 Aug  3 08:29 parport0

-----------------------------------

the offending and failing code was at libieee1284 sources:

libieee1284/src/detect.c, function check_proc_type (void)
....
  if (stat ("/proc/sys/dev/parport", &st) == 0 &&
      S_ISDIR (st.st_mode) &&
      st.st_nlink > 2)
....
This test fail on st.st_nlink > 2 for kernels with new proc interface for
parport. 

patch:

% diff -u detect.c.orig detect.c
--- detect.c.orig       2007-08-03 09:27:29.000000000 +0200
+++ detect.c    2007-08-03 09:27:46.000000000 +0200
@@ -69,8 +69,7 @@
   int which = 0;
   struct stat st;
   if (stat ("/proc/sys/dev/parport", &st) == 0 &&
-      S_ISDIR (st.st_mode) &&
-      st.st_nlink > 2)
+      S_ISDIR (st.st_mode))
     {
       which = PROC_SYS_DEV_PARPORT_CAPABLE;
       debugprintf ("This system has /proc/sys/dev/parport\n");

-------------------------------------------------------

The above patch to libieee1284 library sources solves the ppdev 
problem w/o need to patch kernel, but i'm unsure what is the
exact meaning of "0" as inode link count on procfs directory
entries, and when this change was made (¿it's a bug or a feature? :)
¿any link?

Thanks in advance
Juan Antonio

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