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Message-ID: <20081014102253.GA13503@elte.hu>
Date: Tue, 14 Oct 2008 12:22:53 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>,
Dmitry Torokhov <dtor@...ightbb.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] serial: fix serial port lock init
> [ 31.099528] BUG: spinlock bad magic on CPU#1, agetty/2608
the patch below fixes this. There's another incarnation of the bug that
i bisected today, a spontaneous reboot crash with certain configs:
| b70ac7718579b5cbf3bdd74fd01132d1c91596f4 is first bad commit
| commit b70ac7718579b5cbf3bdd74fd01132d1c91596f4
| Author: David Miller <davem@...emloft.net>
| Date: Mon Oct 13 10:36:31 2008 +0100
|
| serial: allow 8250 to be used on sparc
# bad: [e7f2f991] Merge phase #5 (misc) of git://git.kernel.org/pub/
# good: [3fa8749e] Linux 2.6.27
# good: [4dd9ec49] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
# good: [5c3c4d9b] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
# good: [1a2217a9] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
# good: [cf81978d] i386: convert hardware exception 15 to an interrup
# good: [c00193f9] Merge branches 'oprofile-v2' and 'timers/hpet' int
# bad: [8f520021] tty: Termios locking - sort out real_tty confusion
# good: [f1ddfd95] ip2: init/deinit cleanup
# bad: [b70ac771] serial: allow 8250 to be used on sparc
# good: [9bde10a4] serial-make-uart_ports-ioport-unsigned-long-fix
# good: [43b11d33] ftdi: A few errors are err() that should be debug
# good: [b5d674ab] 8250: remove a few inlines of dubious value
( but it's the same basic problem: we lost the lock init sequence when a
patch was removed from the middle. )
Ingo
----------------->
>From b15be1e63d0df3a1b4a25e7a28cfca9f93690884 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Tue, 14 Oct 2008 12:14:17 +0200
Subject: [PATCH] serial: fix serial port lock init
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
drivers/serial/8250.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index d4104a3..d3ca7d3 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2969,6 +2969,9 @@ static int __init serial8250_init(void)
"%d ports, IRQ sharing %sabled\n", nr_uarts,
share_irqs ? "en" : "dis");
+ for (i = 0; i < NR_IRQS; i++)
+ spin_lock_init(&irq_lists[i].lock);
+
#ifdef CONFIG_SPARC
ret = sunserial_register_minors(&serial8250_reg, UART_NR);
#else
--
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