[PATCH] linux/igb_uio: make module parameters visible in sysfs

[Shinae Woo <shinae@alkira.net>]

- explicitly set default value for intr_mode
- give read permission on wc_activate
- applying patch gives below visibility

```
$ more /sys/module/igb_uio/parameters/* | cat
::::::::::::::
/sys/module/igb_uio/parameters/intr_mode
::::::::::::::
msix
::::::::::::::
/sys/module/igb_uio/parameters/wc_activate
::::::::::::::
0
```

Signed-off-by: Shinae Woo <shinae@alkira.net>
---
 linux/igb_uio/igb_uio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/linux/igb_uio/igb_uio.c b/linux/igb_uio/igb_uio.c
index 33e0e02..c927ae6 100644
--- a/linux/igb_uio/igb_uio.c
+++ b/linux/igb_uio/igb_uio.c
@@ -44,7 +44,7 @@ struct rte_uio_pci_dev {
 };
 
 static int wc_activate;
-static char *intr_mode;
+static char *intr_mode = RTE_INTR_MODE_MSIX_NAME;
 static enum rte_intr_mode igbuio_intr_mode_preferred = RTE_INTR_MODE_MSIX;
 /* sriov sysfs */
 static ssize_t
@@ -663,7 +663,7 @@ MODULE_PARM_DESC(intr_mode,
 "    " RTE_INTR_MODE_LEGACY_NAME "     Use Legacy interrupt\n"
 "\n");
 
-module_param(wc_activate, int, 0);
+module_param(wc_activate, int, S_IRUGO);
 MODULE_PARM_DESC(wc_activate,
 "Activate support for write combining (WC) (default=0)\n"
 "    0 - disable\n"
-- 
2.20.1