The module parameter is read-only since changing mode after loading
isn't going to work.

Signed-off-by: Stephen Hemminger <shemming@brocade.com>

--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c	2014-05-14 09:32:17.214827796 -0700
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c	2014-05-14 09:32:17.214827796 -0700
@@ -656,7 +656,7 @@ igbuio_pci_exit_module(void)
 module_init(igbuio_pci_init_module);
 module_exit(igbuio_pci_exit_module);
 
-module_param(intr_mode, charp, S_IRUGO | S_IWUSR);
+module_param(intr_mode, charp, S_IRUGO);
 MODULE_PARM_DESC(intr_mode,
 "igb_uio interrupt mode (default=msix):\n"
 "    msix       Use MSIX interrupt\n"