svn commit: r278605 - head/sys/x86/iommu

[Konstantin Belousov]

Author: kib
Date: Wed Feb 11 23:28:28 2015
New Revision: 278605
URL: https://svnweb.freebsd.org/changeset/base/278605

Log:
  vm_page_lookup() accepts read-locked object.
  
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/x86/iommu/intel_utils.c

Modified: head/sys/x86/iommu/intel_utils.c
==============================================================================
--- head/sys/x86/iommu/intel_utils.c	Wed Feb 11 23:05:58 2015	(r278604)
+++ head/sys/x86/iommu/intel_utils.c	Wed Feb 11 23:28:28 2015	(r278605)
@@ -411,11 +411,9 @@ dmar_load_root_entry_ptr(struct dmar_uni
 	 */
 	DMAR_ASSERT_LOCKED(unit);
 
-	/* VM_OBJECT_RLOCK(unit->ctx_obj); */
-	VM_OBJECT_WLOCK(unit->ctx_obj);
+	VM_OBJECT_RLOCK(unit->ctx_obj);
 	root_entry = vm_page_lookup(unit->ctx_obj, 0);
-	/* VM_OBJECT_RUNLOCK(unit->ctx_obj); */
-	VM_OBJECT_WUNLOCK(unit->ctx_obj);
+	VM_OBJECT_RUNLOCK(unit->ctx_obj);
 	dmar_write8(unit, DMAR_RTADDR_REG, VM_PAGE_TO_PHYS(root_entry));
 	dmar_write4(unit, DMAR_GCMD_REG, unit->hw_gcmd | DMAR_GCMD_SRTP);
 	/* XXXKIB should have a timeout */