// SPDX-License-Identifier: GPL-2.0 use kernel::prelude::*; use kernel::time::{Delta, Instant, Monotonic}; /// Wait until `cond` is true or `timeout` elapsed. /// /// When `cond` evaluates to `Some`, its return value is returned. /// /// `Err(ETIMEDOUT)` is returned if `timeout` has been reached without `cond` evaluating to /// `Some`. /// /// TODO[DLAY]: replace with `read_poll_timeout` once it is available. /// (https://lore.kernel.org/lkml/20250220070611.214262-8-fujita.tomonori@gmail.com/) pub(crate) fn wait_on<R, F: Fn() -> Option<R>>(timeout: Delta, cond: F) -> Result<R> { let start_time = Instant::<Monotonic>::now(); loop { if let Some(ret) = cond() { return Ok(ret); } if start_time.elapsed().as_nanos() > timeout.as_nanos() { return Err(ETIMEDOUT); } } }