linux-kernel - Re: [PATCH] hwmon: f71882fg: properly acquire I/O regions while probing

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Date:	Wed, 24 Mar 2010 10:34:37 +0100
From:	Giel van Schijndel <me@...tis.eu>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Hans de Goede <hdegoede@...hat.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	Laurens Leemans <laurens@...nips.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: f71882fg: properly acquire I/O regions while
 probing

On Wed, Mar 24, 2010 at 10:29:42AM +0100, Jean Delvare wrote:
> On Tue, 23 Mar 2010 15:12:15 +0100, Giel van Schijndel wrote:
>>  static u16 f71882fg_read_temp(struct f71882fg_data *data, int nr)
>> @@ -2184,6 +2178,13 @@ static int __init f71882fg_find(int sioaddr, unsigned short *address,
>>  	int err = -ENODEV;
>>  	u16 devid;
>>  
>> +	/* Don't step on other driver's 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;
> 
> This is the wrong error code. This isn't an I/O error. You want -EBUSY.

Ack. New patch follows this line.
========================================================================
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@...tis.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..537841e 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;
 }
 
-- 
1.6.4.4

-- 
Met vriendelijke groet,
With kind regards,
Giel van Schijndel

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