linux-stable.git/drivers/hwmon, branch v4.7.7

hwmon: (adt7411) set bit 3 in CFG1 register

2016-10-07T13:21:18+00:00

commit b53893aae441a034bf4dbbad42fe218561d7d81f upstream.

According to the datasheet you should only write 1 to this bit. If it is
not set, at least AIN3 will return bad values on newer silicon revisions.

Fixes: d84ca5b345c2 ("hwmon: Add driver for ADT7411 voltage and temperature sensor")
Signed-off-by: Michael Walle 
Signed-off-by: Guenter Roeck 
Signed-off-by: Greg Kroah-Hartman

hwmon: (iio_hwmon) fix memory leak in name attribute

2016-09-07T06:34:56+00:00

commit 5d17d3b4bbf3becb89fd48b74340a50a39736f6d upstream.

The "name" variable's memory is now freed when the device is destructed
thanks to devm function.

Signed-off-by: Quentin Schulz 
Reported-by: Guenter Roeck 
Fixes: e0f8a24e0edfd ("staging:iio::hwmon interface client driver.")
Fixes: 61bb53bcbdd86 ("hwmon: (iio_hwmon) Add support for humidity sensors")
Signed-off-by: Guenter Roeck 
Signed-off-by: Greg Kroah-Hartman

hwmon: (it87) Add missing sysfs attribute group terminator

2016-09-07T06:34:56+00:00

commit 3c3292634fc2de1ab97b6aa3222fee647f737adb upstream.

Attribute array it87_attributes_in lacks its NULL terminator,
causing random behavior when operating on the attribute group.

Fixes: 52929715634a ("hwmon: (it87) Use is_visible for voltage sensors")
Signed-off-by: Jean Delvare 
Cc: Martin Blumenstingl 
Cc: Guenter Roeck 
Signed-off-by: Guenter Roeck 
Signed-off-by: Greg Kroah-Hartman

hwmon: (dell-smm) Cache fan_type() calls and change fan detection

2016-06-23T13:24:23+00:00

On more Dell machines (e.g. Dell Precision M3800) fan_type() call is too
expensive (CPU is too long in SMM mode) and cause kernel to hang. This is
bug in Dell SMM or BIOS.

This patch caches type for each fan (as it should not change) and changes
the way how fan presense is detected. First it try function fan_status()
as was before commit f989e55452c7 ("i8k: Add support for fan labels"). And
if that fails fallback to fan_type(). *_status() functions can fail in case
fan is not currently accessible (e.g. present on GPU which is currently
turned off).

Reported-by: Tolga Cakir 
Signed-off-by: Pali Rohár 
Link: https://bugzilla.kernel.org/show_bug.cgi?id=112021
Cc: stable@vger.kernel.org # v4.0+, will need backport
Tested-by: Tolga Cakir 
Signed-off-by: Guenter Roeck

hwmon: (dell-smm) Disallow fan_type() calls on broken machines

2016-06-18T20:03:29+00:00

Some Dell machines have especially broken SMM or BIOS which cause that once
fan_type() is called then CPU fan speed going randomly up and down. And for
fixing this behaviour reboot is required.

So this patch creates fan_type blacklist of affected Dell machines and
disallow fan_type() call on them to prevent that erratic behaviour.

Old blacklist which disabled loading driver on some machines added in
commits a4b45b25f18d ("hwmon: (dell-smm) Blacklist Dell Studio XPS 8100")
and 6220f4ebd7b4 ("hwmon: (dell-smm) Blacklist Dell Studio XPS 8000") were
moved to FAN_TYPE blacklist.

Reported-by: Jan C Peters 
Signed-off-by: Pali Rohár 
Link: https://bugzilla.kernel.org/show_bug.cgi?id=100121
Cc: stable@vger.kernel.org # v4.0+, will need backport
Signed-off-by: Guenter Roeck

hwmon: (dell-smm) Restrict fan control and serial number to CAP_SYS_ADMIN by default

2016-06-18T19:59:58+00:00

For security reasons ordinary user must not be able to control fan speed
via /proc/i8k by default. Some malicious software running under "nobody"
user could be able to turn fan off and cause HW problems. So this patch
changes default value of "restricted" parameter to 1.

Also restrict reading of DMI_PRODUCT_SERIAL from /proc/i8k via "restricted"
parameter. It is because non root user cannot read DMI_PRODUCT_SERIAL from
sysfs file /sys/class/dmi/id/product_serial.

Old non secure behaviour of file /proc/i8k can be achieved by loading this
module with "restricted" parameter set to 0.

Note that this patch has effects only for kernels compiled with CONFIG_I8K
and only for file /proc/i8k. Hwmon interface provided by this driver was
not changed and root access for setting fan speed was needed also before.

Reported-by: Mario Limonciello 
Signed-off-by: Pali Rohár 
Cc: stable@vger.kernel.org # will need backport
Signed-off-by: Guenter Roeck

hwmon: (dell-smm) Fail in ioctl I8K_BIOS_VERSION when bios version is not a number

2016-06-18T19:55:20+00:00

ABI of I8K_BIOS_VERSION ioctl can return only number. But new BIOS versions
contain also other characters, which does not fit into that ABI. So in case
of non digit values return -EINVAL.

Reported-by: Mario Limonciello 
Signed-off-by: Pali Rohár 
Signed-off-by: Guenter Roeck

hwmon: (lm90) use proper type for update_interval

2016-06-08T03:13:05+00:00

The code handles this variable always as unsigned, so adapt the type.

Signed-off-by: Wolfram Sang 
Signed-off-by: Guenter Roeck

hwmon: (fam15h_power) Disable preemption when reading registers

2016-06-08T03:11:10+00:00

We need to read a bunch of registers on each compute unit and possibly
on the current CPU too. Disable preemption around it. Otherwise, you
get:

  BUG: using smp_processor_id() in preemptible [00000000] code: systemd-udevd/327
  caller is read_registers+0x6a/0x110 [fam15h_power]
  CPU: 3 PID: 327 Comm: systemd-udevd Not tainted 4.7.0-rc1+ #4
  Hardware name: HP HP EliteBook 745 G3/807E, BIOS N73 Ver. 01.08 01/28/2016
  ...

Suggested-by: Thomas Gleixner 
Signed-off-by: Borislav Petkov 
Cc: Rui Huang 
Cc: Sherry Hurwitz 
Cc: Guenter Roeck 
Acked-by: Huang Rui 
Tested-by: Huang Rui 
Fixes: fa7943449943 ("hwmon: (fam15h_power) Add compute unit accumulated power")
Signed-off-by: Guenter Roeck

Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging

2016-05-26T16:48:23+00:00

Pull hwmon fixlets from Jean Delvare.

* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  Documentation/hwmon: Update links in max34440
  hwmon: (emc2103) Fix typo in MODULE_PARM_DESC