From: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Date: Tue, 18 Feb 2014 19:55:22 +0000 (-0600)
Subject: [SCSI] hpsa: only allow REQ_TYPE_FS to use fast path
X-Git-Tag: v3.15-rc1~136^2~130
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f6ae5cd24491647a011aead90d47523d875e443;p=pandora-kernel.git

[SCSI] hpsa: only allow REQ_TYPE_FS to use fast path

When commands sent down the "fast path" fail, they must be re-tried down the
normal RAID path.  We do this by kicking i/o's back to the scsi mid layer with
a DID_SOFT_ERROR status, which causes them to be retried.  This won't work for
SG_IO's and other non REQ_TYPE_FS i/o's which could get kicked all the way back
to the application, which may have no idea that the command needs resubmitting
and likely no way to resubmit it in such a way the that driver can recognize it
as a resubmit and send it down the normal RAID path.  So we just always send
non REQ_TYPE_FS i/o's down the normal RAID path, never down the "fast path".

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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