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311f08a xfs: memory barrier before wake_up_bit()
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commit 311f08acde635e4e5ccea9b9d8c856cc2e0ced95
Author: Alex Elder <elder@xxxxxxxxxxx>
Date: Mon Feb 4 10:13:11 2013 -0600
xfs: memory barrier before wake_up_bit()
In xfs_ifunlock() there is a call to wake_up_bit() after clearing
the flush lock on the xfs inode. This is not guaranteed to be safe,
as noted in the comments above wake_up_bit() beginning with:
In order for this to function properly, as it uses
waitqueue_active() internally, some kind of memory
barrier must be done prior to calling this.
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
Reviewed-by: Dave Chinner <david@xxxxxxxxxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
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Summary of changes:
fs/xfs/xfs_inode.h | 1 +
1 file changed, 1 insertion(+)
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