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>

diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c
index ca34e5c48702fa2e6a2a1f681bf5a5299a4ec967..537841ef44b99d179318f7510dbf28dddedb0ed8 100644 (file)
--- 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;
 }