diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index aa1ac79bccbc0e06dfd32226096b0694600e68a1..cb6b54aebd6fcc0239568cfc5e479f75ce96b324 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -189,7 +189,6 @@ drm_unset_busid(struct drm_device *dev,
 	kfree(master->unique);
 	master->unique = NULL;
 	master->unique_len = 0;
-	master->unique_size = 0;
 }
 
 /**
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index 8efea6b4602ba735076a69a3e8ae431babed1d50..e266927bb9f1daa35f000edb9ddf4e20b43ade9b 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -138,7 +138,6 @@ static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
 		return -ENOMEM;
 
 	master->unique_len = strlen(master->unique);
-	master->unique_size = master->unique_len + 1;
 	return 0;
 }
 
@@ -149,8 +148,7 @@ int drm_pci_set_unique(struct drm_device *dev,
 	int domain, bus, slot, func, ret;
 
 	master->unique_len = u->unique_len;
-	master->unique_size = u->unique_len + 1;
-	master->unique = kmalloc(master->unique_size, GFP_KERNEL);
+	master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
 	if (!master->unique) {
 		ret = -ENOMEM;
 		goto err;
diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index 0c09ddd50c1577769b9385a598fcce5d302f6459..f197a2b6911a1bec359044e0171772c530161ecc 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -82,7 +82,6 @@ static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *mas
 		return -ENOMEM;
 
 	master->unique_len = strlen(master->unique);
-	master->unique_size = master->unique_len;
 	return 0;
 }
 
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a8b24fcddb8c8c67144d72e6f18438dc1e840e7a..98b1eafebc1c6b258c8c02376dd01175e86d4597 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -574,7 +574,6 @@ struct drm_gem_object {
  * @minor: Link back to minor char device we are master for. Immutable.
  * @unique: Unique identifier: e.g. busid. Protected by drm_global_mutex.
  * @unique_len: Length of unique field. Protected by drm_global_mutex.
- * @unique_size: Amount allocated. Protected by drm_global_mutex.
  * @magiclist: Hash of used authentication tokens. Protected by struct_mutex.
  * @magicfree: List of used authentication tokens. Protected by struct_mutex.
  * @lock: DRI lock information.
@@ -585,7 +584,6 @@ struct drm_master {
 	struct drm_minor *minor;
 	char *unique;
 	int unique_len;
-	int unique_size;
 	struct drm_open_hash magiclist;
 	struct list_head magicfree;
 	struct drm_lock_data lock;