tree 872571a7a68dde3fd1f830c2d3ff62d5dbae3110
parent 35b5c55fee08e6e4001ba98060a2d0b82f70b5f4
author Tom Peng <tom_peng@usish.com> 1246451846 +0800
committer James Bottomley <James.Bottomley@HansenPartnership.com> 1247766644 -0500

[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>