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authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2018-09-10 23:22:16 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2018-10-03 14:36:58 +0200
commit37e7742c55ba856eaec7e35673ee370f36eb17f3 (patch)
tree4da2076a1b16c7ebaa9e531d1ee660241b56d67e /drivers/clocksource
parent22627c6f3ed3d9d0df13eec3c831b08f8186c38e (diff)
downloadlinux-37e7742c55ba856eaec7e35673ee370f36eb17f3.tar.bz2
clocksource/drivers/sh_cmt: Fix clocksource width for 32-bit machines
The driver seems to abuse *unsigned long* not only for the (32-bit) register values but also for the 'sh_cmt_channel::total_cycles' which needs to always be 64-bit -- as a result, the clocksource's mask is needlessly clamped down to 32-bits on the 32-bit machines... Fixes: 19bdc9d061bc ("clocksource: sh_cmt clocksource support") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/sh_cmt.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index efaf00d1f260..0c74489956b2 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -100,7 +100,7 @@ struct sh_cmt_channel {
raw_spinlock_t lock;
struct clock_event_device ced;
struct clocksource cs;
- unsigned long total_cycles;
+ u64 total_cycles;
bool cs_enabled;
};
@@ -605,8 +605,8 @@ static u64 sh_cmt_clocksource_read(struct clocksource *cs)
{
struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
unsigned long flags;
- unsigned long value;
u32 has_wrapped;
+ u64 value;
u32 raw;
raw_spin_lock_irqsave(&ch->lock, flags);
@@ -680,7 +680,7 @@ static int sh_cmt_register_clocksource(struct sh_cmt_channel *ch,
cs->disable = sh_cmt_clocksource_disable;
cs->suspend = sh_cmt_clocksource_suspend;
cs->resume = sh_cmt_clocksource_resume;
- cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
+ cs->mask = CLOCKSOURCE_MASK(sizeof(u64) * 8);
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
dev_info(&ch->cmt->pdev->dev, "ch%u: used as clock source\n",