extmod/nimble: Add timeout to deinit. #17247
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If the BLE radio stops responding before deinit is called the function can get stuck waiting for an event that is never received, particularly if the radio is external or on a separate core. Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #17247 +/- ##
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Coverage 98.54% 98.54%
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Files 169 169
Lines 21890 21898 +8
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+ Hits 21572 21580 +8
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Code size report: |
andrewleech
commented
May 6, 2025
| @@ -629,13 +641,12 @@ int mp_bluetooth_init(void) { | |||
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| // Run the scheduler while we wait for stack startup. | |||
| // On non-ringbuffer builds (NimBLE on STM32/Unix) this will also poll the UART and run the event queue. | |||
| mp_uint_t timeout_start_ticks_ms = mp_hal_ticks_ms(); | |||
| volatile mp_uint_t start = mp_hal_ticks_ms(); | |||
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volatile wasn't meant to be left here, I'll remove
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Should extend this to more closely match the init functionality with regard to raising exceptions on failure |
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Summary
If the BLE radio stops responding before deinit is called the function can get stuck waiting for an event that is never received, particularly if the radio is external or on a separate core.
This PR adds a timeout, similar to the timeout already used in the init function. That init function timeout was also
simplified as part of this change.
Relates to #17246
Testing
This has been tested on a stm32wb55 where the deinit was intermittently locking up waiting for the state to change.
This happened on a semi-regular basis on an application automated test suite which was running through hundreds of cycles over a number of hours.
Trade-offs and Alternatives
The main alternative to this is relying on watchdog to break the unit out of the infinite C loop once the failure occurs, but this is not appropriate for all applications.