From: Suresh Siddha <suresh.b.siddha@intel.com>
Subject: dmar: fix dmar_parse_dev() devices_cnt error condition check
References: fate #303948 and fate #303984
Patch-Mainline: queued for .28
Commit-ID: 0f4896665a02b465ddca59a560983b24ec28c64b

Signed-off-by: Thomas Renninger <trenn@suse.de>

It is possible that,
instead of PCI endpoint/sub-hierarchy structures, only IO-APIC/HPET
devices may be reported under device scope structures. Fix the devices_cnt
error check, which cares about only PCI structures and removes the
dma-remapping unit structure (dmaru) when the devices_cnt is zero
and include_all flag is not set.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
 drivers/pci/dmar.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.26/drivers/pci/dmar.c
===================================================================
--- linux-2.6.26.orig/drivers/pci/dmar.c
+++ linux-2.6.26/drivers/pci/dmar.c
@@ -212,7 +212,7 @@ dmar_parse_dev(struct dmar_drhd_unit *dm
 		include_all = 1;
 	}
 
-	if (ret || (dmaru->devices_cnt == 0 && !dmaru->include_all)) {
+	if (ret) {
 		list_del(&dmaru->list);
 		kfree(dmaru);
 	}