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6fa498cba1
There's a very odd but predictable sequence of events that breaks Wi-Fi when using both cores: 1) CPU1 calls pendsv_suspend() - for example sleep() causes a softtimer node to be inserted, which calls pendsv_suspend(). 2) CYW43 sends wakeup IRQ. CPU0 GPIO IRQ handler schedules PendSV and disables the GPIO IRQ on CPU0, to re-enable after cyw43_poll() runs and completes. 3) CPU0 PendSV_Handler runs, sees pendsv is suspended, exits. 4) CPU1 calls pendsv_resume() and pendsv_resume() sees PendSV is pending and triggers it on CPU1. 5) CPU1 runs PendSV_Handler, runs cyw43_poll(), and at the end it re-enables the IRQ *but now on CPU1*. However CPU1 has GPIO IRQs disabled, so the CYW43 interrupt never runs again... The fix in this commit is to always enable/disable the interrupt on CPU0. This isn't supported by the pico-sdk, but it is supported by the hardware. Fixes issue #16779. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>