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staging: rtl8192u: fix bitshift calculation in r819xU_phy.c

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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 <burzalodowa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xenia Ragiadakou 2013-06-15 07:29:01 +03:00 • committed by Greg Kroah-Hartman
parent 409359a12d
commit 391c72a30b
1 changed files with 3 additions and 5 deletions
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8
drivers/staging/rtl8192u/r819xU_phy.c
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@ -7,6 +7,8 @@
#include "r819xU_firmware_img.h" #include "r819xU_firmware_img.h"
#include "dot11d.h" #include "dot11d.h"
#include <linux/bitops.h>
static u32 RF_CHANNEL_TABLE_ZEBRA[] = { static u32 RF_CHANNEL_TABLE_ZEBRA[] = {
0, 0,
0x085c, //2412 1 0x085c, //2412 1
@ -45,11 +47,7 @@ static u32 RF_CHANNEL_TABLE_ZEBRA[] = {
u32 rtl8192_CalculateBitShift(u32 dwBitMask) u32 rtl8192_CalculateBitShift(u32 dwBitMask)
{ {
u32 i; u32 i;
for (i=0; i<=31; i++) i = ffs(dwBitMask) - 1;
{
if (((dwBitMask>>i)&0x1) == 1)
break;
}
return i; return i;
} }
/****************************************************************************** /******************************************************************************