Claude review: misc: fastrpc: fix context leak and hang on signal-interrupted invoke

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Overall Series Review

Subject: misc: fastrpc: fix context leak and hang on signal-interrupted invoke
Author: Anandu Krishnan E <anandu.e@oss.qualcomm.com>
Patches: 2
Reviewed: 2026-05-26T07:14:36.687555

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This is a single-patch fix for a real and well-described bug: when a signal interrupts `wait_for_completion_interruptible()` during a fastrpc invoke, the context leaks and retrying causes DSP hangs due to duplicate invocations. The approach of saving interrupted contexts on a per-user list and restoring them on retry is reasonable and follows the existing code patterns.

The patch also replaces the old `invoke_interrupted_mmaps` mechanism (which only saved DMA buffers at the channel level) with context-level preservation at the user level — a more correct granularity.

However, there are several issues ranging from a potential correctness bug to missing handling for edge cases.

**Verdict: Needs revision** — the matching logic has a correctness issue with PID vs TID semantics, the `handle` parameter is not checked in the restore path, and the mmaps leak concern is not addressed.

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