fix race-condition locking up the firmware after instant-stop #26
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When all block buffers are in use, some waiting loops store (block_buffer_head+1) before the loop starts, under the assumption that no other code can add a block to the buffer. Which is kind of correct. But if an instant-stop did happen during such a loop it got stuck there forever.
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We noticed this in our fablab. The fix was tested&verified in my pulseraster fork (https://github.com/martinxyz/LasaurApp), but since the affected firmware code in this repo looks the same I'm submitting it here. |
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When all block buffers are in use, some waiting loops store (block_buffer_head+1)
before the loop starts, under the assumption that no other code can add a block
to the buffer. Which is kind of correct. But if an instant-stop did happen during
such a loop it got stuck there forever.