detach ds from all rm sessions before destruction

Fixes #1617

repos/base-linux/src/core/include/dataspace_component.h

@@ -98,6 +98,11 @@ namespace Genode {
 			 */
 			bool owner(Dataspace_owner * const o) const { return _owner == o; }
 
+			/**
+			 * Detach dataspace from all rm sessions.
+			 */
+			void detach_from_rm_sessions() { }
+
 			/*************************
 			 ** Dataspace interface **
 			 *************************/

repos/base-nova/src/core/ram_session_support.cc

@@ -43,8 +43,6 @@ void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds)
 
 	platform()->region_alloc()->free((void*)ds->core_local_addr(),
 	                                 page_rounded_size);
-
-	ds->assign_core_local_addr(0);
 }
 
 

repos/base/src/core/dataspace_component.cc

@@ -31,8 +31,7 @@ void Dataspace_component::detached_from(Rm_region *region)
 	_regions.remove(region);
 }
 
-
-Dataspace_component::~Dataspace_component()
+void Dataspace_component::detach_from_rm_sessions()
 {
 	_lock.lock();
 
@@ -50,3 +49,8 @@ Dataspace_component::~Dataspace_component()
 
 	_lock.unlock();
 }
+
+Dataspace_component::~Dataspace_component()
+{
+	detach_from_rm_sessions();
+}

repos/base/src/core/include/dataspace_component.h

@@ -140,6 +140,11 @@ namespace Genode {
 			void attached_to(Rm_region *region);
 			void detached_from(Rm_region *region);
 
+			/**
+			 * Detach dataspace from all rm sessions.
+			 */
+			void detach_from_rm_sessions();
+
 			/**
 			 * Check if dataspace is owned by a specific owner
 			 */

repos/base/src/core/ram_session_component.cc

@@ -42,11 +42,12 @@ void Ram_session_component::_free_ds(Dataspace_component *ds)
 	/* tell entry point to forget the dataspace */
 	_ds_ep->dissolve(ds);
 
+	/* remove dataspace from all RM sessions */
+	ds->detach_from_rm_sessions();
+
 	/* destroy native shared memory representation */
 	_revoke_ram_ds(ds);
 
-	/* XXX: remove dataspace from all RM sessions */
-
 	/* free physical memory that was backing the dataspace */
 	_ram_alloc->free((void *)ds->phys_addr(), ds_size);