obj-y += utalloc.o utdebug.o uteval.o utinit.o utmisc.o utxface.o \
utcopy.o utdelete.o utglobal.o utmath.o utobject.o \
- utstate.o utmutex.o utobject.o utresrc.o
+ utstate.o utmutex.o utobject.o utresrc.o utlock.o
ACPI_EXTERN u8 acpi_gbl_integer_byte_width;
ACPI_EXTERN u8 acpi_gbl_integer_nybble_width;
+/* Reader/Writer lock is used for namespace walk and dynamic table unload */
+
+ACPI_EXTERN struct acpi_rw_lock acpi_gbl_namespace_rw_lock;
+
/*****************************************************************************
*
* Mutual exlusion within ACPICA subsystem
#endif
#endif
+/* Lock structure for reader/writer interfaces */
+
+struct acpi_rw_lock {
+ acpi_mutex writer_mutex;
+ acpi_mutex reader_mutex;
+ u32 num_readers;
+};
+
/*
* Predefined handles for spinlocks used within the subsystem.
* These spinlocks are created by acpi_ut_mutex_initialize
void acpi_tb_terminate(void);
-void acpi_tb_delete_namespace_by_owner(u32 table_index);
+acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index);
acpi_status acpi_tb_allocate_owner_id(u32 table_index);
acpi_status
acpi_ut_execute_sxds(struct acpi_namespace_node *device_node, u8 * highest);
+/*
+ * utlock - reader/writer locks
+ */
+acpi_status acpi_ut_create_rw_lock(struct acpi_rw_lock *lock);
+
+void acpi_ut_delete_rw_lock(struct acpi_rw_lock *lock);
+
+acpi_status acpi_ut_acquire_read_lock(struct acpi_rw_lock *lock);
+
+acpi_status acpi_ut_release_read_lock(struct acpi_rw_lock *lock);
+
+acpi_status acpi_ut_acquire_write_lock(struct acpi_rw_lock *lock);
+
+void acpi_ut_release_write_lock(struct acpi_rw_lock *lock);
+
/*
* utobject - internal object create/delete/cache routines
*/
/* Walk entire namespace from the supplied root */
- status = acpi_walk_namespace(ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
- acpi_ds_init_one_object, &info, NULL);
+ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /*
+ * We don't use acpi_walk_namespace since we do not want to acquire
+ * the namespace reader lock.
+ */
+ status =
+ acpi_ns_walk_namespace(ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
+ ACPI_NS_WALK_UNLOCK, acpi_ds_init_one_object,
+ &info, NULL);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
}
+ (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
status = acpi_get_table_by_index(table_index, &table);
if (ACPI_FAILURE(status)) {
}
}
- /*
- * Delete the entire namespace under this table Node
- * (Offset contains the table_id)
- */
- acpi_tb_delete_namespace_by_owner(table_index);
- (void)acpi_tb_release_owner_id(table_index);
+ /* Delete the portion of the namespace owned by this table */
+
+ status = acpi_tb_delete_namespace_by_owner(table_index);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ (void)acpi_tb_release_owner_id(table_index);
acpi_tb_set_table_loaded_flag(table_index, FALSE);
/* Table unloaded, remove a reference to the ddb_handle object */
}
/*
- * Lock the namespace around the walk.
- * The namespace will be unlocked/locked around each call
- * to the user function - since this function
- * must be allowed to make Acpi calls itself.
+ * Need to acquire the namespace reader lock to prevent interference
+ * with any concurrent table unloads (which causes the deletion of
+ * namespace objects). We cannot allow the deletion of a namespace node
+ * while the user function is using it. The exception to this are the
+ * nodes created and deleted during control method execution -- these
+ * nodes are marked as temporary nodes and are ignored by the namespace
+ * walk. Thus, control methods can be executed while holding the
+ * namespace deletion lock (and the user function can execute control
+ * methods.)
+ */
+ status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);
+ if (ACPI_FAILURE(status)) {
+ return status;
+ }
+
+ /*
+ * Lock the namespace around the walk. The namespace will be
+ * unlocked/locked around each call to the user function - since the user
+ * function must be allowed to make ACPICA calls itself (for example, it
+ * will typically execute control methods during device enumeration.)
*/
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
+ goto unlock_and_exit;
}
status = acpi_ns_walk_namespace(type, start_object, max_depth,
- ACPI_NS_WALK_UNLOCK,
- user_function, context, return_value);
+ ACPI_NS_WALK_UNLOCK, user_function,
+ context, return_value);
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+
+ unlock_and_exit:
+ (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock);
return_ACPI_STATUS(status);
}
*
* PARAMETERS: table_index - Table index
*
- * RETURN: None
+ * RETURN: Status
*
* DESCRIPTION: Delete all namespace objects created when this table was loaded.
*
******************************************************************************/
-void acpi_tb_delete_namespace_by_owner(u32 table_index)
+acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
{
acpi_owner_id owner_id;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ if (table_index >= acpi_gbl_root_table_list.count) {
+
+ /* The table index does not exist */
- (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
- if (table_index < acpi_gbl_root_table_list.count) {
- owner_id =
- acpi_gbl_root_table_list.tables[table_index].owner_id;
- } else {
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
- return;
+ return_ACPI_STATUS(AE_NOT_EXIST);
}
+ /* Get the owner ID for this table, used to delete namespace nodes */
+
+ owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+
+ /*
+ * Need to acquire the namespace writer lock to prevent interference
+ * with any concurrent namespace walks. The interpreter must be
+ * released during the deletion since the acquisition of the deletion
+ * lock may block, and also since the execution of a namespace walk
+ * must be allowed to use the interpreter.
+ */
+ acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
+ status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
+
acpi_ns_delete_namespace_by_owner(owner_id);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
+
+ status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
+ return_ACPI_STATUS(status);
}
/*******************************************************************************
--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: utlock - Reader/Writer lock interfaces
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2009, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT ACPI_UTILITIES
+ACPI_MODULE_NAME("utlock")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_create_rw_lock
+ * acpi_ut_delete_rw_lock
+ *
+ * PARAMETERS: Lock - Pointer to a valid RW lock
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Reader/writer lock creation and deletion interfaces.
+ *
+ ******************************************************************************/
+acpi_status acpi_ut_create_rw_lock(struct acpi_rw_lock *lock)
+{
+ acpi_status status;
+
+ lock->num_readers = 0;
+ status = acpi_os_create_mutex(&lock->reader_mutex);
+ if (ACPI_FAILURE(status)) {
+ return status;
+ }
+
+ status = acpi_os_create_mutex(&lock->writer_mutex);
+ return status;
+}
+
+void acpi_ut_delete_rw_lock(struct acpi_rw_lock *lock)
+{
+
+ acpi_os_delete_mutex(lock->reader_mutex);
+ acpi_os_delete_mutex(lock->writer_mutex);
+
+ lock->num_readers = 0;
+ lock->reader_mutex = NULL;
+ lock->writer_mutex = NULL;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_acquire_read_lock
+ * acpi_ut_release_read_lock
+ *
+ * PARAMETERS: Lock - Pointer to a valid RW lock
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Reader interfaces for reader/writer locks. On acquisition,
+ * only the first reader acquires the write mutex. On release,
+ * only the last reader releases the write mutex. Although this
+ * algorithm can in theory starve writers, this should not be a
+ * problem with ACPICA since the subsystem is infrequently used
+ * in comparison to (for example) an I/O system.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_acquire_read_lock(struct acpi_rw_lock *lock)
+{
+ acpi_status status;
+
+ status = acpi_os_acquire_mutex(lock->reader_mutex, ACPI_WAIT_FOREVER);
+ if (ACPI_FAILURE(status)) {
+ return status;
+ }
+
+ /* Acquire the write lock only for the first reader */
+
+ lock->num_readers++;
+ if (lock->num_readers == 1) {
+ status =
+ acpi_os_acquire_mutex(lock->writer_mutex,
+ ACPI_WAIT_FOREVER);
+ }
+
+ acpi_os_release_mutex(lock->reader_mutex);
+ return status;
+}
+
+acpi_status acpi_ut_release_read_lock(struct acpi_rw_lock *lock)
+{
+ acpi_status status;
+
+ status = acpi_os_acquire_mutex(lock->reader_mutex, ACPI_WAIT_FOREVER);
+ if (ACPI_FAILURE(status)) {
+ return status;
+ }
+
+ /* Release the write lock only for the very last reader */
+
+ lock->num_readers--;
+ if (lock->num_readers == 0) {
+ acpi_os_release_mutex(lock->writer_mutex);
+ }
+
+ acpi_os_release_mutex(lock->reader_mutex);
+ return status;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_acquire_write_lock
+ * acpi_ut_release_write_lock
+ *
+ * PARAMETERS: Lock - Pointer to a valid RW lock
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Writer interfaces for reader/writer locks. Simply acquire or
+ * release the writer mutex associated with the lock. Acquisition
+ * of the lock is fully exclusive and will block all readers and
+ * writers until it is released.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ut_acquire_write_lock(struct acpi_rw_lock *lock)
+{
+ acpi_status status;
+
+ status = acpi_os_acquire_mutex(lock->writer_mutex, ACPI_WAIT_FOREVER);
+ return status;
+}
+
+void acpi_ut_release_write_lock(struct acpi_rw_lock *lock)
+{
+
+ acpi_os_release_mutex(lock->writer_mutex);
+}
*
* RETURN: Status
*
- * DESCRIPTION: Create the system mutex objects.
+ * DESCRIPTION: Create the system mutex objects. This includes mutexes,
+ * spin locks, and reader/writer locks.
*
******************************************************************************/
ACPI_FUNCTION_TRACE(ut_mutex_initialize);
- /*
- * Create each of the predefined mutex objects
- */
+ /* Create each of the predefined mutex objects */
+
for (i = 0; i < ACPI_NUM_MUTEX; i++) {
status = acpi_ut_create_mutex(i);
if (ACPI_FAILURE(status)) {
spin_lock_init(acpi_gbl_gpe_lock);
spin_lock_init(acpi_gbl_hardware_lock);
+ /* Create the reader/writer lock for namespace access */
+
+ status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
return_ACPI_STATUS(status);
}
*
* RETURN: None.
*
- * DESCRIPTION: Delete all of the system mutex objects.
+ * DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
+ * spin locks, and reader/writer locks.
*
******************************************************************************/
ACPI_FUNCTION_TRACE(ut_mutex_terminate);
- /*
- * Delete each predefined mutex object
- */
+ /* Delete each predefined mutex object */
+
for (i = 0; i < ACPI_NUM_MUTEX; i++) {
(void)acpi_ut_delete_mutex(i);
}
acpi_os_delete_lock(acpi_gbl_gpe_lock);
acpi_os_delete_lock(acpi_gbl_hardware_lock);
+
+ /* Delete the reader/writer lock */
+
+ acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_lock);
return_VOID;
}
projects / linux-2.6-omap-h63xx.git / commitdiff