From: Giel van Schijndel <me@mortis.eu>
Date: Thu, 27 May 2010 17:58:43 +0000 (+0200)
Subject: hwmon: (f71882fg) Acquire I/O regions while we're working with them
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=729d273aa7c86eb1406ade4eadf249cff188bf9a;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

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 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;
 }