Commit 05ec9e26 authored May 05, 2007 by Dave Kleikamp

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@austin.ibm.com>

parent 3cbb1c8e

fs/jfs/jfs_logmgr.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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();
		__set_current_state(TASK_RUNNING);
		}