From: Jean Delvare Date: Tue, 19 Apr 2005 04:16:59 +0000 (-0700) Subject: [PATCH] I2C: Fix incorrect sysfs file permissions in it87 and via686a drivers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1d66c64c3cee10a465cd3f8bd9191bbeb718f650;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [PATCH] I2C: Fix incorrect sysfs file permissions in it87 and via686a drivers 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/i2c/chips/it87.c b/drivers/i2c/chips/it87.c index 3d484a7aff12..cf7e6898754f 100644 --- a/drivers/i2c/chips/it87.c +++ b/drivers/i2c/chips/it87.c @@ -668,7 +668,7 @@ static ssize_t show_alarms(struct device *dev, char *buf) 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) diff --git a/drivers/i2c/chips/via686a.c b/drivers/i2c/chips/via686a.c index ecd1e1de3f05..6614a59cecd4 100644 --- a/drivers/i2c/chips/via686a.c +++ b/drivers/i2c/chips/via686a.c @@ -574,7 +574,7 @@ static ssize_t show_alarms(struct device *dev, char *buf) { 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 */