Re: [PATCH v2] net: 9p: advance iov on empty read

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Tue, 2 Mar 2021 17:19:32 +0800 you wrote:

I met below warning when cating a small size(about 80bytes) txt file
on 9pfs(msize=2097152 is passed to 9p mount option), the reason is we
miss iov_iter_advance() if the read count is 0 for zerocopy case, so
we didn't truncate the pipe, then iov_iter_pipe() thinks the pipe is
full. Fix it by removing the exception for 0 to ensure to call
iov_iter_advance() even on empty read for zerocopy case.

[...]

Here is the summary with links:
  - [v2] net: 9p: advance iov on empty read
    https://git.kernel.org/netdev/net/c/d65614a01d24

You are awesome, thank you!
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