RTEMS | Flashdev API returns 0 if a callback is not implemented (#5391)

Fri Nov 7 22:29:47 UTC 2025

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5391

## Summary
Currently, the flashdev API will return 0 (success) if an IOCTL call is not implemented in the backend. This can cause the caller to use uninitialized values as if they were good data.

The API should instead place ENOSYS (function not implemented) in `errno` with a return value of `-1`.

This was discovered by trying to use a flashdev backend (xqspi) that didn't support the newer sector commands with the flashdev shell commands and the JFFS2 flashdev adapter.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5391
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