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authorGiel van Schijndel <me@mortis.eu>2010-05-27 19:58:43 +0200
committerJean Delvare <khali@linux-fr.org>2010-05-27 19:58:43 +0200
commit729d273aa7c86eb1406ade4eadf249cff188bf9a (patch)
treec79a0072d3b71c762db8ddbefa68ed54ea68ffa5
parentbd328acdc6160b95f5d7127a9df3172892f35627 (diff)
downloadlinux-729d273aa7c86eb1406ade4eadf249cff188bf9a.tar.bz2
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>
-rw-r--r--drivers/hwmon/f71882fg.c8
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;
}