w1: w1 temp: fix negative termperature calculation
authorIan Dall <ian@beware.dropbear.id.au>
Fri, 23 Apr 2010 17:17:53 +0000 (13:17 -0400)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 24 Apr 2010 18:31:25 +0000 (11:31 -0700)
commit9a6a1ecd9e9b5d046a236da2f7eb6b6812f04229
tree8426a3850a3742d09f3a44188a35725e7f0f5cf1
parent7716fa66034c408b0f59e8b9c62f793befa5b338
w1: w1 temp: fix negative termperature calculation

Fix regression caused by commit 507e2fbaaacb6f164b4125b87c5002f95143174b
("w1: w1 temp calculation overflow fix") whereby negative temperatures for
the DS18B20 are not converted properly.

When the temperature exceeds 32767 milli-degrees the temperature overflows
to -32768 millidegrees.  These are both well within the -55 - +125 degree
range for the sensor.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=12646

Signed-of-by: Ian Dall <ian@beware.dropbear.id.au>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Tested-by: Karsten Elfenbein <kelfe@gmx.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/w1/slaves/w1_therm.c