On 26 Jan, Andrew Morton wrote:
> arm:
>
> drivers/firewire/fw-device.c: In function `fw_device_init':
> drivers/firewire/fw-device.c:495: warning: implicit declaration of function `cmpxchg'
>
> We can't use cmpxchg in generic code.
From: Stefan Richter <[email protected]>
Subject: firewire: use atomic type for fw_device.state
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/firewire/fw-card.c | 2 +-
drivers/firewire/fw-device.c | 6 +++---
drivers/firewire/fw-device.h | 3 ++-
3 files changed, 6 insertions(+), 5 deletions(-)
Index: linux-2.6.20-rc5/drivers/firewire/fw-device.h
===================================================================
--- linux-2.6.20-rc5.orig/drivers/firewire/fw-device.h
+++ linux-2.6.20-rc5/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;
Index: linux-2.6.20-rc5/drivers/firewire/fw-device.c
===================================================================
--- linux-2.6.20-rc5.orig/drivers/firewire/fw-device.c
+++ linux-2.6.20-rc5/drivers/firewire/fw-device.c
@@ -494,7 +494,7 @@ static void fw_device_init(struct work_s
* 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,
* 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,
* 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);
Index: linux-2.6.20-rc5/drivers/firewire/fw-card.c
===================================================================
--- linux-2.6.20-rc5.orig/drivers/firewire/fw-card.c
+++ linux-2.6.20-rc5/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);
--
Stefan Richter
-=====-=-=== ---= ==-==
http://arcgraph.de/sr/
-
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