firewire: use atomic type for fw_device.state

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

3 files changed, 6 insertions, 5 deletions

diff --git a/drivers/firewire/fw-card.c b/drivers/firewire/fw-card.c
index f94874ce58af..7f5dc43ec131 100644
--- a/drivers/firewire/fw-card.c
+++ b/drivers/firewire/fw-card.c
@@ -302,7 +302,7 @@ fw_card_bm_work(struct work_struct *work)
                 /* Either link_on is false, or we failed to read the
                  * config rom.  In either case, pick another root. */
                 new_root_id = card->local_node->node_id;
-        } else if (root->state != FW_DEVICE_RUNNING) {
+        } else if (atomic_read(&root->state) != FW_DEVICE_RUNNING) {
                 /* If we haven't probed this device yet, bail out now
                  * and let's try again once that's done. */
                 spin_unlock_irqrestore(&card->lock, flags);
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c
index 4ea8d4d08a61..85b6f2cfa414 100644
--- a/drivers/firewire/fw-device.c
+++ b/drivers/firewire/fw-device.c
@@ -494,7 +494,7 @@ static void fw_device_init(struct work_struct *work)
          * necessary.  We have to use the atomic cmpxchg here to avoid
          * racing with the FW_NODE_DESTROYED case in
          * fw_node_event(). */
-        if (cmpxchg(&device->state,
+        if (atomic_cmpxchg(&device->state,
                     FW_DEVICE_INITIALIZING,
                     FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
                 fw_device_shutdown(&device->work.work);
@@ -551,7 +551,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
                  * device_for_each_child() in FW_NODE_UPDATED is
                  * doesn't freak out. */
                 device_initialize(&device->device);
-                device->state = FW_DEVICE_INITIALIZING;
+                atomic_set(&device->state, FW_DEVICE_INITIALIZING);
                 device->card = fw_card_get(card);
                 device->node = fw_node_get(node);
                 device->node_id = node->node_id;
@@ -596,7 +596,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
                  * the device in shutdown state to have that code fail
                  * to create the device. */
                 device = node->data;
-                if (xchg(&device->state,
+                if (atomic_xchg(&device->state,
                          FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
                         INIT_DELAYED_WORK(&device->work, fw_device_shutdown);
                         schedule_delayed_work(&device->work, 0);
diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h
index 5399b48f5538..402a785ceedb 100644
--- a/drivers/firewire/fw-device.h
+++ b/drivers/firewire/fw-device.h
@@ -24,6 +24,7 @@
 
 #include <linux/fs.h>
 #include <linux/cdev.h>
+#include <asm/atomic.h>
 
 enum fw_device_state {
         FW_DEVICE_INITIALIZING,
@@ -32,7 +33,7 @@ enum fw_device_state {
 };
 
 struct fw_device {
-        int state;
+        atomic_t state;
         struct fw_node *node;
         int node_id;
         int generation;