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Description of problem:
The BIO_ definitions are meant to be ored into the bi_flags field like so:
bio->bi_flags |= (1<<BIO_*);
There are a couple of places in the upstream kernel that get this wrong, doing instead:
bio->bi_flags |= BIO_*;

In RHEL 6, there is only one such issue.  Note that in RHEL 6 we have convenience macros for discard flush and fua (BIO_DISCARD, BIO_FLUSH, BIO_FUA), which already do the bit shifting.

Initially reported upstream here:
http://groups.google.com/group/linux.kernel/browse_thread/thread/87487f9987731480/da7877b036bfac34?show_docid=da7877b036bfac34&pli=1


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
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Expected results:


Additional info:

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Patch(es) available on kernel-2.6.32-250.el6

All storage-qe test show no issue for this bug in Beta testing.

VERIFY.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0862.html