linux-kernel - Re: [PATCH net-next] net: devmem: drop iterator type check

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Message-ID: <CAHS8izNJQFGFjVr42VVh2zHJ+PxfUYCupEdHka2dd0no_b=GHA@mail.gmail.com>
Date: Fri, 16 May 2025 21:45:08 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Stanislav Fomichev <stfomichev@...il.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, horms@...nel.org, sagi@...mberg.me, 
	willemb@...gle.com, asml.silence@...il.com, kaiyuanz@...gle.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: devmem: drop iterator type check

On Fri, May 16, 2025 at 3:54 PM Stanislav Fomichev <stfomichev@...il.com> wrote:
>
> sendmsg() with a single iov becomes ITER_UBUF, sendmsg() with multiple
> iovs becomes ITER_IOVEC. Instead of adjusting the check to include
> ITER_UBUF, drop the check completely. The callers are guaranteed
> to happen from system call side and we don't need to pay runtime
> cost to verify it.
>
> Fixes: bd61848900bf ("net: devmem: Implement TX path")
> Signed-off-by: Stanislav Fomichev <stfomichev@...il.com>

Looks good to me, but can we please bundle this with the fix for
ITER_UBUF, and if possible get some test coverage in ncdevmem?