[PATCH v6] soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read

[Andrew Jeffery]

On Tue, 2026-06-16 at 07:30 +0000, Karthikeyan KS wrote:
> Hi Andrew,
> 
> Happy to. Short version: ast2600-evb can't hit the SMP timing window,
> so I reproduce each missing piece deliberately. The driver code under
> test is unmodified -- only the stimulus and the post-race state are
> injected. Stock qemu-system-arm (Debian 8.2.2), no QEMU changes.
> 
> Three obstacles, and what I did about each:

This looks like a lot of heavily LLM-assisted effort. Please review the
relevant documentation, starting here:

   https://docs.kernel.org/process/submitting-patches.html#using-assisted-by

I feel the testing strategy is pretty questionable. Any invariant
violation is possible with that type of meddling.

I was interested in whether you drove the interrupt sequence via
emulated hardware. I asked because upstream qemu doesn't currently
support the snoop device.

In v3 you said:

   The issue was observed on physical AST2600 (dual-core Cortex-A7)
   in production under heavy POST code traffic during concurrent
   userspace reads.

   https://lore.kernel.org/all/20260527175939.2939714-1-karthiproffesional@gmail.com/

Is this true? What platform did you test with?

Andrew