On Thu, Jan 21, 2021 at 9:57 AM Greg Kroah-Hartman
[off-list ref] wrote:

Incremental patches please as these are already in my public branches
and I would have to revert them and add new ones but that's messy, so
fixes on top is fine.

Ok. And since I think you put that first tty_write conversion patch in
a different branch from the tty_read one, I did the fixup patches for
the two as separate patches, even though they really just do the exact
same thing.

So here's three patches: the two fixups for the hung_up_tty case, and
the EOVERFLOW error case that Jiri also noted. I've also updated the
'tty-splice' branch if you prefer them that way.

And I *should* say that I still haven't tested _any_ of the HDLC
changes. I have no idea how to do that, and if somebody can point to a
test-case (or better yet, actually has a real life situation where
they use it and can test this all) it would be great.

Jiri, any other issues, or any comment of yours I missed? I didn't do
the min() thing, I find the explicit conditional more legible myself,
but won't complain if somebody else then disagrees and wants to clean
it up.

(On the matter of cleanups: when reading through the ICANON handling
in canon_copy_from_read_buf(), that code is really completely
incomprehensible. I know how it works, and why it does it, but I had
to remind myself, because the code just looks crazy and does things
like "*nr+1" to walk _past_ the point we actually copy etc. I was very
tempted to rewrite that entirely, but wanting to keep my changes
minimal and targeted made me not do so).

                Linus