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authorIan Dall <ian@beware.dropbear.id.au>2009-02-11 16:04:46 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-11 17:25:37 -0500
commit507e2fbaaacb6f164b4125b87c5002f95143174b (patch)
tree6407941a4dfecbd71e6222f2d640f3c5ed2715d0
parent4d48a542b42747c36a5937447d9c3de7c897ea50 (diff)
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>
-rw-r--r--drivers/w1/slaves/w1_therm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index 2c8dff9f77da..1ed3d554e372 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -115,7 +115,7 @@ static struct w1_therm_family_converter w1_therm_families[] = {
115 115
116static inline int w1_DS18B20_convert_temp(u8 rom[9]) 116static 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 t = t*1000/16; 119 t = t*1000/16;
120 return t; 120 return t;
121} 121}