From: Andy Grover <agrover@redhat.com>
Date: Tue, 15 Apr 2014 21:13:12 +0000 (-0700)
Subject: target: Allow non-supporting backends to set pi_prot_type to 0
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~172^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=448ba904160f9d8f69217c28a1692cee5afbff88;p=pandora-kernel.git

target: Allow non-supporting backends to set pi_prot_type to 0

Userspace tools assume if a value is read from configfs, it is valid
and will not cause an error if the same value is written back. The only
valid value for pi_prot_type for backends not supporting DIF is 0, so allow
this particular value to be set without returning an error.

Reported-by: Krzysztof Chojnowski <frirajder@gmail.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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