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Add critsec to rp2040 xfer, check endpoint status #2474

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Add critsec to rp2040 xfer, check endpoint status #2474

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Commits on Jun 22, 2024

  1. Add critsec to rp2040 xfer, check endpoint status 

     - Implemented a critical section for the rp2040 port, which now
   prevents an IRQ from clearing the endpoint data structures while a
   transfer was in progress, which would then lead to a null pointer
   derefence.
 - Fixed a null-pointer dereference regarding ep->endpoint_control for
   endpoint 0, which does not have a control register.
    @gemarcano
    gemarcano committed Jun 22, 2024
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