[03/07] I2C: Fix incorrect sysfs file permissions in it87 and via686a drivers

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------

The it87 and via686a hardware monitoring drivers each create a sysfs
file named "alarms" in R/W mode, while they should really create it in
read-only mode. Since we don't provide a store function for these files,
write attempts to these files will do something undefined (I guess) and
bad (I am sure). My own try resulted in a locked terminal (where I
attempted the write) and a 100% CPU load until next reboot.

As a side note, wouldn't it make sense to check, when creating sysfs
files, that readable files have a non-NULL show method, and writable
files have a non-NULL store method? I know drivers are not supposed to
do stupid things, but there is already a BUG_ON for several conditions
in sysfs_create_file, so maybe we could add two more?

Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

--- linux-2.6.12-rc1-bk5/drivers/i2c/chips/it87.c.orig	2005-04-02 18:09:59.000000000 +0200
+++ linux-2.6.12-rc1-bk5/drivers/i2c/chips/it87.c	2005-04-02 21:12:46.000000000 +0200
@@ -668,7 +668,7 @@
 	struct it87_data *data = it87_update_device(dev);
 	return sprintf(buf,"%d\n", ALARMS_FROM_REG(data->alarms));
 }
-static DEVICE_ATTR(alarms, S_IRUGO | S_IWUSR, show_alarms, NULL);
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 
 static ssize_t
 show_vrm_reg(struct device *dev, char *buf)
--- linux-2.6.12-rc1-bk5/drivers/i2c/chips/via686a.c.orig	2005-04-02 18:22:48.000000000 +0200
+++ linux-2.6.12-rc1-bk5/drivers/i2c/chips/via686a.c	2005-04-02 21:12:55.000000000 +0200
@@ -574,7 +574,7 @@
 	struct via686a_data *data = via686a_update_device(dev);
 	return sprintf(buf,"%d\n", ALARMS_FROM_REG(data->alarms));
 }
-static DEVICE_ATTR(alarms, S_IRUGO | S_IWUSR, show_alarms, NULL);
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 
 /* The driver. I choose to use type i2c_driver, as at is identical to both
    smbus_driver and isa_driver, and clients could be of either kind */


-- 
Jean Delvare

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