firewire: cdev: replace some spin_lock_irqsave by spin_lock_irq

All of these functions are entered with IRQs enabled.
Hence the unconditional spin_unlock_irq can be used.

Function:                  Caller context:
    dequeue_event()            client process, via read(2)
    fill_bus_reset_event()     fw-device.c update worqueue job
    release_client_resource()  client process, via ioctl(2)
    fw_device_op_release()     client process, via close(2)

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

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 6b33f15..3d816a6 100644 (file)
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -237,7 +237,6 @@ static void queue_event(struct client *client, struct event *event,
 static int dequeue_event(struct client *client,
                         char __user *buffer, size_t count)
 {
-       unsigned long flags;
        struct event *event;
        size_t size, total;
        int i, ret;
@@ -252,10 +251,10 @@ static int dequeue_event(struct client *client,
                       fw_device_is_shutdown(client->device))
                return -ENODEV;
 
-       spin_lock_irqsave(&client->lock, flags);
+       spin_lock_irq(&client->lock);
        event = list_first_entry(&client->event_list, struct event, link);
        list_del(&event->link);
-       spin_unlock_irqrestore(&client->lock, flags);
+       spin_unlock_irq(&client->lock);
 
        total = 0;
        for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
@@ -286,9 +285,8 @@ static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
                                 struct client *client)
 {
        struct fw_card *card = client->device->card;
-       unsigned long flags;
 
-       spin_lock_irqsave(&card->lock, flags);
+       spin_lock_irq(&card->lock);
 
        event->closure       = client->bus_reset_closure;
        event->type          = FW_CDEV_EVENT_BUS_RESET;
@@ -299,7 +297,7 @@ static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
        event->irm_node_id   = card->irm_node->node_id;
        event->root_node_id  = card->root_node->node_id;
 
-       spin_unlock_irqrestore(&card->lock, flags);
+       spin_unlock_irq(&card->lock);
 }
 
 static void for_each_client(struct fw_device *device,
@@ -432,16 +430,15 @@ static int release_client_resource(struct client *client, u32 handle,
                                   struct client_resource **resource)
 {
        struct client_resource *r;
-       unsigned long flags;
 
-       spin_lock_irqsave(&client->lock, flags);
+       spin_lock_irq(&client->lock);
        if (client->in_shutdown)
                r = NULL;
        else
                r = idr_find(&client->resource_idr, handle);
        if (r && r->release == release)
                idr_remove(&client->resource_idr, handle);
-       spin_unlock_irqrestore(&client->lock, flags);
+       spin_unlock_irq(&client->lock);
 
        if (!(r && r->release == release))
                return -EINVAL;
@@ -1384,7 +1381,6 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
 {
        struct client *client = file->private_data;
        struct event *e, *next_e;
-       unsigned long flags;
 
        mutex_lock(&client->device->client_list_mutex);
        list_del(&client->link);
@@ -1397,9 +1393,9 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
                fw_iso_context_destroy(client->iso_context);
 
        /* Freeze client->resource_idr and client->event_list */
-       spin_lock_irqsave(&client->lock, flags);
+       spin_lock_irq(&client->lock);
        client->in_shutdown = true;
-       spin_unlock_irqrestore(&client->lock, flags);
+       spin_unlock_irq(&client->lock);
 
        idr_for_each(&client->resource_idr, shutdown_resource, client);
        idr_remove_all(&client->resource_idr);