Re: [PATCH net 2/4] ice: Stop processing VF messages during teardown

On Mon,  9 Aug 2021 10:14:00 -0700 Tony Nguyen wrote:

When VFs are setup and torn down in quick succession, it is possible
that a VF is torn down by the PF while the VF's virtchnl requests are
still in the PF's mailbox ring. Processing the VF's virtchnl request
when the VF itself doesn't exist results in undefined behavior. Fix
this by adding a check to stop processing virtchnl requests when VF
teardown is in progress.

What is "undefined behavior" in this context? Please improve the commit
message. It should describe misbehavior visible to the user, failing
that what will happen from kernel/device perspective. Or state that it's
just a "fix" to align with some internal driver <> firmware spec...