Re: [PATCH] firmware: arm_ffa: Unmap RxTx buffers on device shutdown

[Maxi Saparov]

Apologies, I failed to spot Carol's earlier patch for the same
problem before sending this:

  https://lore.kernel.org/all/20260818224404.3694580-1-csoto@xxxxxxxxxx/

Please disregard my patch in favor of that one. It covers more than
mine does.

Some corroborating data from our side, in case it helps that patch
along. We hit this on NVIDIA GB200 systems in production diagnostics:
after a kexec from a kernel with FF-A active, the next kernel's
FFA_RXTX_MAP is denied and the driver fails to probe until a full
system reset. I can also confirm Carol's observation that unmapping
the buffers alone is not enough. The notification bitmap is retained
by the SPMC in the same way, so the cleanup has to cover both.

Happy to provide Tested-by on the next revision of Carol's patch.

Maxi