wengzhe opened a new pull request, #9041:
URL: https://github.com/apache/nuttx/pull/9041
## Summary
Fix clear condition in TCP ofoseg input (when receiving an out-of-ordered
ACK)
Note:
- `iob_trimhead` won't return `NULL` when it's applying on normal IOB.
- Keep `dev->d_iob == NULL` to avoid `iob_trimhead` changed.
- `iob_free_chain` will do nothing when applied to `NULL`.
## Impact
TCP Out-of-order segment process, especially when receiving an
out-of-ordered ACK.
## Testing
CI/Manually.
We have a case that an http server gives an out-of-ordered ACK, and triggers
problem on NuttX client.
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