Revision d979e9f9ecab04c1ecca741370e30a8a498893f5 authored by Johan Hovold on 27 August 2014, 09:55:18 UTC, committed by Greg Kroah-Hartman on 27 August 2014, 20:23:52 UTC
Make sure to verify the maximum number of endpoints per type to avoid writing beyond the end of a stack-allocated array. The current usb-serial implementation is limited to eight ports per interface but failed to verify that the number of endpoints of a certain type reported by a device did not exceed this limit. Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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lm77
Kernel driver lm77
==================
Supported chips:
* National Semiconductor LM77
Prefix: 'lm77'
Addresses scanned: I2C 0x48 - 0x4b
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
Author: Andras BALI <drewie@freemail.hu>
Description
-----------
The LM77 implements one temperature sensor. The temperature
sensor incorporates a band-gap type temperature sensor,
10-bit ADC, and a digital comparator with user-programmable upper
and lower limit values.
The LM77 implements 3 limits: low (temp1_min), high (temp1_max) and
critical (temp1_crit.) It also implements an hysteresis mechanism which
applies to all 3 limits. The relative difference is stored in a single
register on the chip, which means that the relative difference between
the limit and its hysteresis is always the same for all 3 limits.
This implementation detail implies the following:
* When setting a limit, its hysteresis will automatically follow, the
difference staying unchanged. For example, if the old critical limit
was 80 degrees C, and the hysteresis was 75 degrees C, and you change
the critical limit to 90 degrees C, then the hysteresis will
automatically change to 85 degrees C.
* All 3 hysteresis can't be set independently. We decided to make
temp1_crit_hyst writable, while temp1_min_hyst and temp1_max_hyst are
read-only. Setting temp1_crit_hyst writes the difference between
temp1_crit_hyst and temp1_crit into the chip, and the same relative
hysteresis applies automatically to the low and high limits.
* The limits should be set before the hysteresis.
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