From 5379a5fdf3cb2b23d00da2a1298167f9a1fb002a Mon Sep 17 00:00:00 2001
From: Phil Sutter <n0-1@freewrt.org>
Date: Wed, 12 Nov 2008 00:09:30 +0100
Subject: [PATCH] MIPS: RB532: Fix bit swapping in rb532_set_bit()
The algorithm works unconditionally. If bitval is one, the first line is
a no op and the second line sets the bit at offset position. Vice versa,
if bitval is zero, the first line clears the bit at offset position and
the second line is a no op.
Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/rb532/gpio.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/mips/rb532/gpio.c b/arch/mips/rb532/gpio.c
index 0e84c8ab6a39..e35cb75a3ae7 100644
--- a/arch/mips/rb532/gpio.c
+++ b/arch/mips/rb532/gpio.c
@@ -119,13 +119,11 @@ static inline void rb532_set_bit(unsigned bitval,
unsigned long flags;
u32 val;
- bitval = !!bitval; /* map parameter to {0,1} */
-
local_irq_save(flags);
val = readl(ioaddr);
- val &= ~( ~bitval << offset ); /* unset bit if bitval == 0 */
- val |= ( bitval << offset ); /* set bit if bitval == 1 */
+ val &= ~(!bitval << offset); /* unset bit if bitval == 0 */
+ val |= (!!bitval << offset); /* set bit if bitval == 1 */
writel(val, ioaddr);
local_irq_restore(flags);
--
2.34.1