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Freertos background asserts if IPv6 is enabled (#1591)

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If LWIP_IPV6=1 a request to update the multicast list occurs in a
callback in the low priority interrupt.

This makes an ioctl call into the driver, at the end of which is a call
to cyw43_await_background_or_timeout_us (see CYW43_DO_IOCTL_WAIT).
It is attempting to delay until there's "some work to do".

For Freertos this fails an assertion as an attempt is made to acquire a
semaphore in interrupt context.

Fixes #1590
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Peter Harper 2023-12-21 13:51:21 +00:00 committed by GitHub
parent 9ff8a98df6
commit 9f45e3c905
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src/rp2_common/pico_cyw43_driver/cyw43_driver.c
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@ -164,6 +164,10 @@ void cyw43_thread_lock_check(void) {
#endif #endif
void cyw43_await_background_or_timeout_us(uint32_t timeout_us) { void cyw43_await_background_or_timeout_us(uint32_t timeout_us) {
if (__get_current_exception() > 0) {
async_context_wait_until(cyw43_async_context, make_timeout_time_us(timeout_us));
return;
}
async_context_wait_for_work_until(cyw43_async_context, make_timeout_time_us(timeout_us)); async_context_wait_for_work_until(cyw43_async_context, make_timeout_time_us(timeout_us));
} }