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From: Giel van Schijndel on 24 Mar 2010 05:10
Acquire the I/O region for the Super I/O chip while we're working on it.

Signed-off-by: Giel van Schijndel <me(a)mortis.eu>
---
drivers/hwmon/f71882fg.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c
index ca34e5c..fe7b671 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 -EIO;
+ }
+
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;
}

--
1.6.4.4

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Prev: doc: watchdog simple example: don't fail on fsync()
Next: [PATCH] hwmon: f71882fg: code cleanup