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: v2.6.31-rc6~69^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5381837f125cc62ad703fbcdfcd7566fc81fd404;p=pandora-kernel.git

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

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>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---

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