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authorFelix Fietkau <nbd@nbd.name>2018-02-28 10:56:10 +0100
committerThomas Gleixner <tglx@linutronix.de>2018-02-28 13:55:14 +0100
commit5753405e27f8fe4c42c1537d3ddbd9e058e54cdc (patch)
treeb1319bec974fe4b8274c44fc07b0e4da24607d6b /drivers/clocksource
parentf287eb9013ccf199cbfa4eabd80c36fedfc15a73 (diff)
downloadlinux-5753405e27f8fe4c42c1537d3ddbd9e058e54cdc.tar.bz2
clocksource/drivers/mips-gic-timer: Use correct shift count to extract data
__gic_clocksource_init() extracts the GIC_CONFIG_COUNTBITS field from read_gic_config() by right shifting the register value. The shift count is determined by the most significant bit (__fls) of the bitmask which is wrong as it shifts out the complete bitfield. Use the least significant bit (__ffs) instead to shift the bitfield down to bit 0. Fixes: e07127a077c7 ("clocksource: mips-gic-timer: Use new GIC accessor functions") Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: daniel.lezcano@linaro.org Cc: paul.burton@imgtec.com Link: https://lkml.kernel.org/r/20180228095610.50341-1-nbd@nbd.name
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/mips-gic-timer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index 65e18c86d9b9..986b6796b631 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);