[PATCH] rust: time: add debug assertions for out-of-range input in fsleep()

[Sang-Heon Jeon <ekffu200098@gmail.com>]

fsleep() documents out-of-range input as a bug but does not check
it, unlike udelay(). Add `debug_assert!` calls to catch it in
debug builds.

Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
---
Hello,

I found this small inconsistency while reading the code. The same
check was applied to udelay() [1] but does not seem to have been
extended to fsleep(). Please let me know if I have misunderstood
anything.

[1] https://lore.kernel.org/all/20251103112958.2961517-2-fujita.tomonori@gmail.com

Best Regards,
Sang-Heon Jeon
---
 rust/kernel/time/delay.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rust/kernel/time/delay.rs b/rust/kernel/time/delay.rs
index b5b1b42797a0..1e699fe647ff 100644
--- a/rust/kernel/time/delay.rs
+++ b/rust/kernel/time/delay.rs
@@ -32,6 +32,9 @@ pub fn fsleep(delta: Delta) {
     // overflow inside fsleep, which could lead to unintentional infinite sleep.
     const MAX_DELTA: Delta = Delta::from_micros(i32::MAX as i64);
 
+    debug_assert!(delta.as_nanos() >= 0);
+    debug_assert!(delta <= MAX_DELTA);
+
     let delta = if (Delta::ZERO..=MAX_DELTA).contains(&delta) {
         delta
     } else {
-- 
2.43.0