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[PATCH] JFS: Fix race waking up jfsIO kernel thread

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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@linux.vnet.ibm.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dave Kleikamp
2007-05-15 22:53:36 -05:00
committed by Chris Wright
parent 0b7da0500b
commit cd37423cc0
1 changed files with 2 additions and 1 deletions
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fs/jfs/jfs_logmgr.c
+2 -1
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@@ -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;
}