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Commit e05c6786 authored by Krunoslav Kovac's avatar Krunoslav Kovac Committed by Greg Kroah-Hartman
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drm/amd/display: fix pow() crashing when given base 0 



commit d2e59d0ff4c44d1f6f8ed884a5bea7d1bb7fd98c upstream.

[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: default avatarKrunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: default avatarAnthony Koo <Anthony.Koo@amd.com>
Acked-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d25a2b92

drivers/gpu/drm/amd/display/include/fixed31_32.h

+3 −0
Original line number Diff line number Diff line
@@ -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)

{

	if (arg1.value == 0)

		return arg2.value == 0 ? dc_fixpt_one : dc_fixpt_zero;



	return dc_fixpt_exp(

		dc_fixpt_mul(

			dc_fixpt_log(arg1),