nrf5x: Fix race condition during startup #1221
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hathach
reviewed
Dec 8, 2021
When NRF5x device is reset by software (after DFU for example), power event is ready from the beginning. When power interrupt is triggered before tud_init() finished USBD_IRQn is enabled before it would be enabled in tud_init(). This in turn may result in BUS RESET event being sent from USB interrupt to USB task when queue is not initialized yet. This scenario often happens in Mynewt build where queue creation takes more time. To prevent this scenario USBD_IRQn is not enabled in power event interrupt handler before dcd_init() was called.
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hathach
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Dec 8, 2021
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PS: github ci seesm to have network issue, need to re-run the build. will merge when it complete. |
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Describe the PR
When NRF5x device is reset by software (after DFU for example),
power event is ready from the beginning.
When power interrupt is triggered before tud_init() finished
USBD_IRQn is enabled before it would be enabled in tud_init().
This in turn may result in BUS RESET event being sent from
USB interrupt to USB task when queue is not initialized yet.
This scenario often happens in Mynewt build where queue creation
takes more time.
To prevent this scenario USBD_IRQn is not enabled in power event
interrupt handler before dcd_init() was called.
Additional context
Fixes #1154
This solution is simple enough but I'm opened to other solutions.