diff options
| author | Aaron Lu <aaron.lu@intel.com> | 2014-05-21 16:33:27 +0800 |
|---|---|---|
| committer | Zhang Rui <rui.zhang@intel.com> | 2014-06-30 10:17:27 +0800 |
| commit | e8db5d6736a712a3e2280c0e31f4b301d85172d8 (patch) | |
| tree | 046ef84dcb4d9395070b0491da0f6bc0f9914a2f /drivers/thermal | |
| parent | f14d1c24c64bec45c01b0bc7b0dde2e54a797662 (diff) | |
| download | linux-e8db5d6736a712a3e2280c0e31f4b301d85172d8.tar.bz2 | |
thermal: hwmon: Make the check for critical temp valid consistent
On 05/21/2014 04:22 PM, Aaron Lu wrote:
> On 05/21/2014 01:57 PM, Kui Zhang wrote:
>> Hello,
>>
>> I get following error when rmmod thermal.
>>
>> rmmod thermal
>> Killed
While dealing with this problem, I found another problem that also
results in a kernel crash on thermal module removal:
From: Aaron Lu <aaron.lu@intel.com>
Date: Wed, 21 May 2014 16:05:38 +0800
Subject: [PATCH] thermal: hwmon: Make the check for critical temp valid consistent
We used the tz->ops->get_crit_temp && !tz->ops->get_crit_temp(tz, temp)
to decide if we need to create the temp_crit attribute file but we just
check if tz->ops->get_crit_temp exists to decide if we need to remove
that attribute file. Some ACPI thermal zone doesn't have a valid critical
trip point and that would result in removing a non-existent device file
on thermal module unload.
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/thermal_hwmon.c | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c index fdb07199d9c2..1967bee4f076 100644 --- a/drivers/thermal/thermal_hwmon.c +++ b/drivers/thermal/thermal_hwmon.c @@ -140,6 +140,12 @@ thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon, return NULL; } +static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz) +{ + unsigned long temp; + return tz->ops->get_crit_temp && !tz->ops->get_crit_temp(tz, &temp); +} + int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) { struct thermal_hwmon_device *hwmon; @@ -189,21 +195,18 @@ int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) if (result) goto free_temp_mem; - if (tz->ops->get_crit_temp) { - unsigned long temperature; - if (!tz->ops->get_crit_temp(tz, &temperature)) { - snprintf(temp->temp_crit.name, - sizeof(temp->temp_crit.name), + if (thermal_zone_crit_temp_valid(tz)) { + snprintf(temp->temp_crit.name, + sizeof(temp->temp_crit.name), "temp%d_crit", hwmon->count); - temp->temp_crit.attr.attr.name = temp->temp_crit.name; - temp->temp_crit.attr.attr.mode = 0444; - temp->temp_crit.attr.show = temp_crit_show; - sysfs_attr_init(&temp->temp_crit.attr.attr); - result = device_create_file(hwmon->device, - &temp->temp_crit.attr); - if (result) - goto unregister_input; - } + temp->temp_crit.attr.attr.name = temp->temp_crit.name; + temp->temp_crit.attr.attr.mode = 0444; + temp->temp_crit.attr.show = temp_crit_show; + sysfs_attr_init(&temp->temp_crit.attr.attr); + result = device_create_file(hwmon->device, + &temp->temp_crit.attr); + if (result) + goto unregister_input; } mutex_lock(&thermal_hwmon_list_lock); @@ -250,7 +253,7 @@ void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) } device_remove_file(hwmon->device, &temp->temp_input.attr); - if (tz->ops->get_crit_temp) + if (thermal_zone_crit_temp_valid(tz)) device_remove_file(hwmon->device, &temp->temp_crit.attr); mutex_lock(&thermal_hwmon_list_lock); |