From: Jan Beulich <JBeulich@suse.com>
Date: Mon, 19 Sep 2011 16:32:15 +0000 (+0100)
Subject: xen/pciback: use mutex rather than spinlock in passthrough backend
X-Git-Tag: v3.2-rc1~192^3~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04df355227fa75c015491153cfc93e7ea7a80112;p=pandora-kernel.git

xen/pciback: use mutex rather than spinlock in passthrough backend

To accommodate the call to the callback function from
__xen_pcibk_publish_pci_roots(), which so far dropped and the re-
acquired the lock without checking that the list didn't actually
change, convert the code to use a mutex instead (observing that the
code taking the lock won't ever get called from non-sleepable
context).

As a result, drop the bogus use of list_for_each_entry_safe() and
remove the inappropriate dropping of the lock.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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