diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 32e5591ae7b17edce9cd4e142879d99b58422683..e661994ad18d1c7c30b2aec3de308f1a33b459a2 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -210,9 +210,9 @@ static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, l
 
 static struct async *alloc_async(unsigned int numisoframes)
 {
-        unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
-        struct async *as = kzalloc(assize, GFP_KERNEL);
+	struct async *as;
 
+	as = kzalloc(sizeof(struct async), GFP_KERNEL);
         if (!as)
                 return NULL;
 	as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);