The write_iter callback consumes data from the supplied iov_iter and
wraps it as an IovIterSource.
Its Safety docs required a valid iov_iter for writing, but the
implementation and the IovIterSource contract require one that is valid
for reading. Update the docs to match that direction.
Assisted-by: Codex:GPT-5
Signed-off-by: Yilin Chen <1479826151@qq.com>
Link: https://patch.msgid.link/tencent_8CD671E0F35223030143524D045F3BCAD506@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>