firewire: Implement deallocation of address ranges.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/firewire/fw-device-cdev.c b/drivers/firewire/fw-device-cdev.c
index 175ea042ba3f..ebf0d100805e 100644
--- a/drivers/firewire/fw-device-cdev.c
+++ b/drivers/firewire/fw-device-cdev.c
@@ -467,6 +467,32 @@ static int ioctl_allocate(struct client *client, void __user *arg)
         return 0;
 }
 
+static int ioctl_deallocate(struct client *client, void __user *arg)
+{
+        struct fw_cdev_deallocate request;
+        struct address_handler *handler;
+        unsigned long flags;
+
+        if (copy_from_user(&request, arg, sizeof request))
+                return -EFAULT;
+
+        spin_lock_irqsave(&client->lock, flags);
+        list_for_each_entry(handler, &client->handler_list, link) {
+                if (handler->handler.offset == request.offset) {
+                        list_del(&handler->link);
+                        break;
+                }
+        }
+        spin_unlock_irqrestore(&client->lock, flags);
+
+        if (&handler->link == &client->handler_list)
+                return -EINVAL;
+
+        fw_core_remove_address_handler(&handler->handler);
+
+        return 0;
+}
+
 static int ioctl_send_response(struct client *client, void __user *arg)
 {
         struct fw_cdev_send_response request;
@@ -696,6 +722,8 @@ dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
                 return ioctl_send_request(client, arg);
         case FW_CDEV_IOC_ALLOCATE:
                 return ioctl_allocate(client, arg);
+        case FW_CDEV_IOC_DEALLOCATE:
+                return ioctl_deallocate(client, arg);
         case FW_CDEV_IOC_SEND_RESPONSE:
                 return ioctl_send_response(client, arg);
         case FW_CDEV_IOC_INITIATE_BUS_RESET: