1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 7e73cbaa4121..46bc197a047f 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -109,15 +109,17 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
         struct client *client;
         unsigned long flags;
 
-        device = fw_device_from_devt(inode->i_rdev);
+        device = fw_device_get_by_devt(inode->i_rdev);
         if (device == NULL)
                 return -ENODEV;
 
         client = kzalloc(sizeof(*client), GFP_KERNEL);
-        if (client == NULL)
+        if (client == NULL) {
+                fw_device_put(device);
                 return -ENOMEM;
+        }
 
-        client->device = fw_device_get(device);
+        client->device = device;
         INIT_LIST_HEAD(&client->event_list);
         INIT_LIST_HEAD(&client->resource_list);
         spin_lock_init(&client->lock);
@@ -644,6 +646,10 @@ static int ioctl_create_iso_context(struct client *client, void *buffer)
         struct fw_cdev_create_iso_context *request = buffer;
         struct fw_iso_context *context;
 
+        /* We only support one context at this time. */
+        if (client->iso_context != NULL)
+                return -EBUSY;
+
         if (request->channel > 63)
                 return -EINVAL;
 
@@ -790,8 +796,9 @@ static int ioctl_start_iso(struct client *client, void *buffer)
 {
         struct fw_cdev_start_iso *request = buffer;
 
-        if (request->handle != 0)
+        if (client->iso_context == NULL || request->handle != 0)
                 return -EINVAL;
+
         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
                 if (request->tags == 0 || request->tags > 15)
                         return -EINVAL;
@@ -808,7 +815,7 @@ static int ioctl_stop_iso(struct client *client, void *buffer)
 {
         struct fw_cdev_stop_iso *request = buffer;
 
-        if (request->handle != 0)
+        if (client->iso_context == NULL || request->handle != 0)
                 return -EINVAL;
 
         return fw_iso_context_stop(client->iso_context);