diff options
| author | Chris Rauer <crauer@google.com> | 2023-09-22 18:14:11 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2023-10-19 14:32:13 +0100 |
| commit | 9ef2629712680e70cbf39d8b6cb1ec0e0e2e72fa (patch) | |
| tree | 5ff22d3462fc16295e127422f8d6b419b23e0295 /hw/timer | |
| parent | 3a45f4f5376cad9489e1608f2e4960fd34805546 (diff) | |
hw/timer/npcm7xx_timer: Prevent timer from counting down past zero
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>
Message-id: 20230922181411.2697135-1-crauer@google.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/timer')
| -rw-r--r-- | hw/timer/npcm7xx_timer.c | 3 |
1 files changed, 3 insertions, 0 deletions
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); } |