From: Tom Peng <tom_peng@usish.com>
Date: Wed, 1 Jul 2009 12:37:26 +0000 (+0800)
Subject: SCSI: libsas: reuse the original port when hotplugging phys in wide ports
X-Git-Tag: v2.6.27.30~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25029e626276e1dc5dd58436d230b84b49a38e71;p=pandora-kernel.git

SCSI: libsas: reuse the original port when hotplugging phys in wide ports

commit 5381837f125cc62ad703fbcdfcd7566fc81fd404 upstream.

There's a hotplug problem in the way libsas allocates ports: it loops over the
available ports first trying to add to an existing for a wide port and
otherwise allocating the next free port.  This scheme only works if the port
array is packed from zero, which fails if a port gets hot unplugged and the
array becomes sparse.  In that case, a new port is formed even if there's a
wide port it should be part of.  Fix this by creating two loops over all the
ports:  the first to see if the phy should be part of a wide port and the
second to form a new port in an empty port slot.

Signed-off-by: Tom Peng <tom_peng@usish.com>
Signed-off-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: Lindar Liu <lindar_liu@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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