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drm/amd/display: fix pow() crashing when given base 0 

[Why&How]
pow(a,x) is implemented as exp(x*log(a)). log(0) will crash.
So return 0^x = 0, unless x=0, convention seems to be 0^0 = 1.

Cc: stable@vger.kernel.org
Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Krunoslav Kovac 2020-08-06 17:54:47 -04:00 committed by Alex Deucher
parent db0473f624
commit d2e59d0ff4
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/include/fixed31_32.h
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@ -431,6 +431,9 @@ struct fixed31_32 dc_fixpt_log(struct fixed31_32 arg);
*/ */
static inline struct fixed31_32 dc_fixpt_pow(struct fixed31_32 arg1, struct fixed31_32 arg2) static inline struct fixed31_32 dc_fixpt_pow(struct fixed31_32 arg1, struct fixed31_32 arg2)
{ {
if (arg1.value == 0)
return arg2.value == 0 ? dc_fixpt_one : dc_fixpt_zero;
return dc_fixpt_exp( return dc_fixpt_exp(
dc_fixpt_mul( dc_fixpt_mul(
dc_fixpt_log(arg1), dc_fixpt_log(arg1),