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w1: w1 temp calculation overflow fix

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

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

Fix overflow in left-shift of a u8.

Signed-off-by: Ian Dall <ian@beware.dropbear.id.au>
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Ian Dall and committed by
Linus Torvalds 507e2fba 4d48a542

+1 -1
+1 -1
drivers/w1/slaves/w1_therm.c
··· 115 115 116 116 static inline int w1_DS18B20_convert_temp(u8 rom[9]) 117 117 { 118 - s16 t = (rom[1] << 8) | rom[0]; 118 + int t = ((s16)rom[1] << 8) | rom[0]; 119 119 t = t*1000/16; 120 120 return t; 121 121 }