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Message-Id: <200705170154.l4H1sO07018316@sous-sol.org>
Date: Wed, 16 May 2007 18:54:23 -0700
From: chrisw@...s-sol.org
To: shaggy@...ux.vnet.ibm.com, chrisw@...s-sol.org,
linux-kernel@...r.kernel.org
Cc: stable@...nel.org
Subject: patch jfs-fix-race-waking-up-jfsio-kernel-thread.patch queued to 2.6.21-stable tree
This is a note to let you know that we have just queued up the patch titled
Subject: JFS: Fix race waking up jfsIO kernel thread
to the 2.6.21-stable tree. Its filename is
jfs-fix-race-waking-up-jfsio-kernel-thread.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From stable-bounces@...ux.kernel.org Tue May 15 20:55:43 2007
From: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To: stable@...nel.org
Date: Tue, 15 May 2007 22:53:36 -0500
Message-Id: <1179287616.8339.8.camel@...ikamp.austin.ibm.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>
Subject: JFS: Fix race waking up jfsIO kernel thread
It's possible for a journal I/O request to be added to the log_redrive
queue and the jfsIO thread to be awakened after the thread releases
log_redrive_lock but before it sets its state to TASK_INTERRUPTIBLE.
The jfsIO thread should set the state before giving up the spinlock, so
the waking thread will really wake it.
Signed-off-by: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---
fs/jfs/jfs_logmgr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- linux-2.6.21.1.orig/fs/jfs/jfs_logmgr.c
+++ linux-2.6.21.1/fs/jfs/jfs_logmgr.c
@@ -2354,12 +2354,13 @@ int jfsIOWait(void *arg)
lbmStartIO(bp);
spin_lock_irq(&log_redrive_lock);
}
- spin_unlock_irq(&log_redrive_lock);
if (freezing(current)) {
+ spin_unlock_irq(&log_redrive_lock);
refrigerator();
} else {
set_current_state(TASK_INTERRUPTIBLE);
+ spin_unlock_irq(&log_redrive_lock);
schedule();
current->state = TASK_RUNNING;
}
Patches currently in stable-queue which might be from shaggy@...ux.vnet.ibm.com are
queue-2.6.21/jfs-fix-race-waking-up-jfsio-kernel-thread.patch
-
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