[PATCH v2] clocksource: mips-gic-timer: fix clocksource counter width

From: Felix Fietkau
Date: Wed Feb 28 2018 - 04:56:18 EST


This code is trying to extract the GIC_CONFIG_COUNTBITS field from
read_gic_config(), so it needs to shift count_width right by the index
of the least significant bit (__ffs) instead of the most significant bit
(__fls) of the field mask.

Fixes: e07127a077c7 ("clocksource: mips-gic-timer: Use new GIC accessor functions")
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
---
drivers/clocksource/mips-gic-timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index a04808a21d4e..bf0eee78c6ef 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -166,7 +166,7 @@ static int __init __gic_clocksource_init(void)

/* Set clocksource mask. */
count_width = read_gic_config() & GIC_CONFIG_COUNTBITS;
- count_width >>= __fls(GIC_CONFIG_COUNTBITS);
+ count_width >>= __ffs(GIC_CONFIG_COUNTBITS);
count_width *= 4;
count_width += 32;
gic_clocksource.mask = CLOCKSOURCE_MASK(count_width);
--
2.14.2