tree 904c70d4ed15dd79a003c34bad2e25cff9522420
parent d479540dbaba6f7acdb48e0242fee868c7a68116
author Davide Libenzi <davidel@xmailserver.org> 1207888159 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1207926403 -0700

eventfd/kaio integration fix

Jeff Roberson discovered a race when using kaio eventfd based notifications.
When it occurs it can lead tomissed wakeups and hung userspace.

This patch fixes the race by moving the notification inside the spinlocked
section of kaio.  The operation is safe since eventfd spinlock and kaio one
are unrelated.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Jeff Roberson <jroberson@chesapeake.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>