From 391c72a30bba9d569d5762a2f18d0dd4f3bdc5ba Mon Sep 17 00:00:00 2001 From: Xenia Ragiadakou Date: Sat, 15 Jun 2013 07:29:01 +0300 Subject: [PATCH] staging: rtl8192u: fix bitshift calculation in r819xU_phy.c This patch uses the ffs linux built-in routine in the computation of the bitshift to take advantage of architecture specific instructions that implement this computation more efficiently. Signed-off-by: Xenia Ragiadakou Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8192u/r819xU_phy.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/staging/rtl8192u/r819xU_phy.c b/drivers/staging/rtl8192u/r819xU_phy.c index d66d88cc189e..70ab9cd0b29f 100644 --- a/drivers/staging/rtl8192u/r819xU_phy.c +++ b/drivers/staging/rtl8192u/r819xU_phy.c @@ -7,6 +7,8 @@ #include "r819xU_firmware_img.h" #include "dot11d.h" +#include + static u32 RF_CHANNEL_TABLE_ZEBRA[] = { 0, 0x085c, //2412 1 @@ -45,11 +47,7 @@ static u32 RF_CHANNEL_TABLE_ZEBRA[] = { u32 rtl8192_CalculateBitShift(u32 dwBitMask) { u32 i; - for (i=0; i<=31; i++) - { - if (((dwBitMask>>i)&0x1) == 1) - break; - } + i = ffs(dwBitMask) - 1; return i; } /****************************************************************************** -- 2.39.5