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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2009-12-24 21:44:19 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-12-24 21:54:09 -0800
commit1b11c88d3e8f55dc9d193d19de11e3f7abc1b7d7 (patch)
tree51adca3f94ca3a1a31d249faa9da8b6b0d3f8e6b /drivers/input
parent25ae08317647c68ed9276f7bdc07d0d5fd042628 (diff)
Input: ff-memless - another fix for signed to unsigned overflow
The commit 9e68177ef93b2f34eee5a1e1707bceef4b9ba69c changed 'gain' from signed to unsigned to fix an issue with rumble effect calculation, however it introduced problems when calculating constant effects. Having 'gain' being unsigned int was an unfortunate choice since it dominates all implicit type conversions causing everything to be treated as unsigned int. Let's change it back to signed int and simply add proper casts to rumble effect calculations. Reported-by: Gary Stein <lordcnidarian@gmail.com> Acked-by: Anssi Hannula <anssi.hannula@iki.fi> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/ff-memless.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/input/ff-memless.c b/drivers/input/ff-memless.c
index decc51f45bfd..9667a5fd6bd7 100644
--- a/drivers/input/ff-memless.c
+++ b/drivers/input/ff-memless.c
@@ -225,7 +225,7 @@ static int get_compatible_type(struct ff_device *ff, int effect_type)
*/
static void ml_combine_effects(struct ff_effect *effect,
struct ml_effect_state *state,
- unsigned int gain)
+ int gain)
{
struct ff_effect *new = state->effect;
unsigned int strong, weak, i;
@@ -252,8 +252,8 @@ static void ml_combine_effects(struct ff_effect *effect,
break;
case FF_RUMBLE:
- strong = new->u.rumble.strong_magnitude * gain / 0xffff;
- weak = new->u.rumble.weak_magnitude * gain / 0xffff;
+ strong = (u32)new->u.rumble.strong_magnitude * gain / 0xffff;
+ weak = (u32)new->u.rumble.weak_magnitude * gain / 0xffff;
effect->u.rumble.strong_magnitude =
min(strong + effect->u.rumble.strong_magnitude,
0xffffU);