|
From: | Chris Rauer |
Subject: | Re: [PATCH] hw/timer/npcm7xx_timer: Prevent timer from counting down past zero |
Date: | Fri, 22 Sep 2023 14:20:31 -0700 |
On Fri, Sep 22, 2023 at 11:14 AM Chris Rauer <crauer@google.com> wrote:The counter register is only 24-bits and counts down. If the timer is
running but the qtimer to reset it hasn't fired off yet, there is a chance
the regster read can return an invalid result.
Signed-off-by: Chris Rauer <crauer@google.com>
---
hw/timer/npcm7xx_timer.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/hw/timer/npcm7xx_timer.c b/hw/timer/npcm7xx_timer.c
index 32f5e021f8..a8bd93aeb2 100644
--- a/hw/timer/npcm7xx_timer.c
+++ b/hw/timer/npcm7xx_timer.c
@@ -138,6 +138,9 @@ static int64_t npcm7xx_timer_count_to_ns(NPCM7xxTimer *t, uint32_t count)
/* Convert a time interval in nanoseconds to a timer cycle count. */
static uint32_t npcm7xx_timer_ns_to_count(NPCM7xxTimer *t, int64_t ns)
{
+ if (ns < 0) {
+ return 0;
+ }
return clock_ns_to_ticks(t->ctrl->clock, ns) /
npcm7xx_tcsr_prescaler(t->tcsr);
}
--
2.42.0.515.g380fc7ccd1-goog
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