firewire: convert client_list_lock to mutex

So far it is only taken in non-atomic contexts.

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

3 files changed, 14 insertions, 16 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 40cc9732dc28..75bbd66f852e 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -24,6 +24,7 @@
 #include <linux/errno.h>
 #include <linux/device.h>
 #include <linux/vmalloc.h>
+#include <linux/mutex.h>
 #include <linux/poll.h>
 #include <linux/preempt.h>
 #include <linux/time.h>
@@ -108,7 +109,6 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
 {
         struct fw_device *device;
         struct client *client;
-        unsigned long flags;
 
         device = fw_device_get_by_devt(inode->i_rdev);
         if (device == NULL)
@@ -133,9 +133,9 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
 
         file->private_data = client;
 
-        spin_lock_irqsave(&device->client_list_lock, flags);
+        mutex_lock(&device->client_list_mutex);
         list_add_tail(&client->link, &device->client_list);
-        spin_unlock_irqrestore(&device->client_list_lock, flags);
+        mutex_unlock(&device->client_list_mutex);
 
         return 0;
 }
@@ -232,14 +232,11 @@ for_each_client(struct fw_device *device,
                 void (*callback)(struct client *client))
 {
         struct client *c;
-        unsigned long flags;
-
-        spin_lock_irqsave(&device->client_list_lock, flags);
 
+        mutex_lock(&device->client_list_mutex);
         list_for_each_entry(c, &device->client_list, link)
                 callback(c);
-
-        spin_unlock_irqrestore(&device->client_list_lock, flags);
+        mutex_unlock(&device->client_list_mutex);
 }
 
 static void
@@ -247,7 +244,7 @@ queue_bus_reset_event(struct client *client)
 {
         struct bus_reset *bus_reset;
 
-        bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
+        bus_reset = kzalloc(sizeof(*bus_reset), GFP_KERNEL);
         if (bus_reset == NULL) {
                 fw_notify("Out of memory when allocating bus reset event\n");
                 return;
@@ -988,7 +985,6 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
         struct client *client = file->private_data;
         struct event *e, *next_e;
         struct client_resource *r, *next_r;
-        unsigned long flags;
 
         if (client->buffer.pages)
                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
@@ -1007,9 +1003,9 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
         list_for_each_entry_safe(e, next_e, &client->event_list, link)
                 kfree(e);
 
-        spin_lock_irqsave(&client->device->client_list_lock, flags);
+        mutex_lock(&client->device->client_list_mutex);
         list_del(&client->link);
-        spin_unlock_irqrestore(&client->device->client_list_lock, flags);
+        mutex_unlock(&client->device->client_list_mutex);
 
         fw_device_put(client->device);
         kfree(client);
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c
index ffde1bed46b2..2de3dd5ebc4b 100644
--- a/drivers/firewire/fw-device.c
+++ b/drivers/firewire/fw-device.c
@@ -27,6 +27,7 @@
 #include <linux/idr.h>
 #include <linux/jiffies.h>
 #include <linux/string.h>
+#include <linux/mutex.h>
 #include <linux/rwsem.h>
 #include <linux/semaphore.h>
 #include <linux/spinlock.h>
@@ -1005,7 +1006,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
                 device->node = fw_node_get(node);
                 device->node_id = node->node_id;
                 device->generation = card->generation;
-                spin_lock_init(&device->client_list_lock);
+                mutex_init(&device->client_list_mutex);
                 INIT_LIST_HEAD(&device->client_list);
 
                 /*
diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h
index 008a7908a865..655d7e838012 100644
--- a/drivers/firewire/fw-device.h
+++ b/drivers/firewire/fw-device.h
@@ -23,7 +23,7 @@
 #include <linux/cdev.h>
 #include <linux/idr.h>
 #include <linux/rwsem.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <asm/atomic.h>
 
 enum fw_device_state {
@@ -65,9 +65,10 @@ struct fw_device {
         bool cmc;
         struct fw_card *card;
         struct device device;
-        /* to prevent deadlocks, never take this lock with card->lock held */
-        spinlock_t client_list_lock;
+
+        struct mutex client_list_mutex;
         struct list_head client_list;
+
         u32 *config_rom;
         size_t config_rom_length;
         int config_rom_retries;