NetBSD Problem Report #48571
From paul@whooppee.com Tue Feb 4 17:55:08 2014
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Date: Tue, 4 Feb 2014 09:55:06 -0800 (PST)
From: paul@whooppee.com
Reply-To: paul@whooppee.com
To: gnats-bugs@NetBSD.org
Subject: config(1) ioconf is insufficient for pseudo-devices
X-Send-Pr-Version: 3.95
>Number: 48571
>Category: bin
>Synopsis: config(1) ioconf is insufficient for pseudo-devices
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: bin-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Feb 04 18:00:00 +0000 2014
>Last-Modified: Wed Aug 19 03:40:00 +0000 2015
>Originator: Paul Goyette
>Release: NetBSD 6.99.28
>Organization:
-------------------------------------------------------------------------
| Paul Goyette | PGP Key fingerprint: | E-mail addresses: |
| Customer Service | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
| Kernel Developer | | pgoyette at netbsd.org |
-------------------------------------------------------------------------
>Environment:
System: NetBSD screamer.whooppee.com 6.99.28 NetBSD 6.99.28 (WHOOPPEE (shared) 2013-12-14 23:34:52) #13: Sat Dec 14 16:05:43 PST 2013 paul@screamer.whooppee.com:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/WHOOPPEE amd64
Architecture: x86_64
Machine: amd64
>Description:
The (undocumented) ioconf statement for config(1) generates structs that
are not useable for calling config_{init,fini}_component().
The generated cfattach structure contains only one entry (of two NULL
pointers) to indicate end-of-list. We need an additional entry that
points the device's cfattach <device>_ca as generated by CFATTACH_DECL*.
Also, the generated ioconf.c file should include an extern declaration
for the <device>_ca structure.
Additionally, the generated file contains an empty cfdata list, with only
a single NULL entry to terminate the list. But the first entry of this
list gets passsed by config_init_component() to config_devalloc() and is
dereferenced in order to pass the driver's name to config_cfdriver_lookup().
This results in a panic.
When used for a "real" device, both of these structures are created to
be directly useable by config_{init,fini}_component().
It would be really nice if we could use ioconf structures and calls to
config_{init,fini}_component to standardize device driver modules, even
for pseudo-devices.
>How-To-Repeat:
>Fix:
>Audit-Trail:
From: "Paul Goyette" <pgoyette@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/48571 CVS commit: src/usr.bin/config
Date: Wed, 19 Aug 2015 03:39:45 +0000
Module Name: src
Committed By: pgoyette
Date: Wed Aug 19 03:39:45 UTC 2015
Modified Files:
src/usr.bin/config: TODO
Log Message:
Insert comment regarding PR/48571 so it doesn't get lost.
config(1) ioconf is insufficient for pseudo-devices
config_{init,fini}_component
To generate a diff of this commit:
cvs rdiff -u -r1.17 -r1.18 src/usr.bin/config/TODO
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.39 2013/11/01 18:47:49 spz Exp $
$NetBSD: gnats_config.sh,v 1.8 2006/05/07 09:23:38 tsutsui Exp $
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