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Commit 2744d2fd authored by Pali Rohár's avatar Pali Rohár Committed by Guenter Roeck
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hwmon: (dell-smm) Disallow fan_type() calls on broken machines



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 a4b45b25 ("hwmon: (dell-smm) Blacklist Dell Studio XPS 8100")
and 6220f4eb ("hwmon: (dell-smm) Blacklist Dell Studio XPS 8000") were
moved to FAN_TYPE blacklist.

Reported-by: default avatarJan C Peters <jcpeters89@gmail.com>
Signed-off-by: default avatarPali Rohár <pali.rohar@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=100121


Cc: stable@vger.kernel.org # v4.0+, will need backport
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 7613663c
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