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arch: risc-v: Fix nsec overflow in riscv_mtimer_current()

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Summary:
- I noticed that mtimer stops around 30min after boot.
- Finally, I found that nesc overflows in riscv_mtimer_current().
- This commit fixes this issue.

Impact:
- None

Testing:
- Tested with rv-virt:nsh on QEMU-7.1

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
This commit is contained in:
Masayuki Ishikawa 2022-12-01 13:46:44 +09:00 committed by Xiang Xiao
parent 0ae242aa8d
commit 3b2685409a
1 changed files with 1 additions and 1 deletions
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2
arch/risc-v/src/common/riscv_mtimer.c
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@ -290,7 +290,7 @@ static int riscv_mtimer_current(struct oneshot_lowerhalf_s *lower,
struct riscv_mtimer_lowerhalf_s *priv =
(struct riscv_mtimer_lowerhalf_s *)lower;
uint64_t mtime = riscv_mtimer_get_mtime(priv);
uint64_t nsec = mtime * NSEC_PER_SEC / priv->freq;
uint64_t nsec = mtime / (priv->freq / USEC_PER_SEC) * NSEC_PER_USEC;
ts->tv_sec = nsec / NSEC_PER_SEC;
ts->tv_nsec = nsec % NSEC_PER_SEC;