Description: cifs dentry refcount leak leads to panic on umount
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=798293
 http://thread.gmane.org/gmane.linux.kernel.cifs/5526
Notes:
Bugs:
upstream: released (3.3-rc7) [5bccda0ebc7c0331b81ac47d39e4b920b198b2cd]
2.6.32-upstream-stable: released (2.6.32.59)
sid: released (3.2.10-1)
2.6.32-squeeze-security: released (2.6.32-41squeeze1) [bugfix/all/cifs-fix-dentry-refcount-leak-when-opening-a-FIFO-on.patch]
3.2-upstream-stable: released (3.2.10) [88d7d4e4a439f32acc56a6d860e415ee71d3df08]