From: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Date: Tue, 26 Nov 2013 13:59:21 +0000 (+0100)
Subject: s390/css: Prevent unnecessary allocation in subchannel loop
X-Git-Tag: v3.14-rc1~184^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47d30674d6c79197fa7bfb0d09d5857f61e0277b;p=pandora-kernel.git

s390/css: Prevent unnecessary allocation in subchannel loop

Subchannel looping function for_each_subchannel_staged() allocates a
subchannel-ID-bitmap to efficiently iterate over the list of known
and unknown subchannels. Since this function is also used to iterate
over known-subchannels only, optimize that case by not requiring the
ID-bitmap allocation and falling back to simple bus_for_each_dev()
looping.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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