hwmon: (f71882fg) Acquire I/O regions while we're working with them

Acquire the I/O region for the Super I/O chip while we're working on it.

Signed-off-by: Giel van Schijndel <me@mortis.eu>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c
index ca34e5c48702..537841ef44b9 100644
--- a/drivers/hwmon/f71882fg.c
+++ b/drivers/hwmon/f71882fg.c
@@ -2178,6 +2178,13 @@ static int __init f71882fg_find(int sioaddr, unsigned short *address,
         int err = -ENODEV;
         u16 devid;
 
+        /* Don't step on other drivers' I/O space by accident */
+        if (!request_region(sioaddr, 2, DRVNAME)) {
+                printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
+                                (int)sioaddr);
+                return -EBUSY;
+        }
+
         superio_enter(sioaddr);
 
         devid = superio_inw(sioaddr, SIO_REG_MANID);
@@ -2232,6 +2239,7 @@ static int __init f71882fg_find(int sioaddr, unsigned short *address,
                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 exit:
         superio_exit(sioaddr);
+        release_region(sioaddr, 2);
         return err;
 }