On Tue, Jan 9, 2024 at 5:43 AM Yu Kuai [off-list ref] wrote:

From: Yu Kuai <redacted>

Commit cf1b6d4441ff ("md: simplify md_seq_ops") introduce following
regressions:

1) If list all_mddevs is emptly, personalities and unused devices won't
   be showed to user anymore.
2) If seq_file buffer overflowed from md_seq_show(), then md_seq_start()
   will be called again, hence personalities will be showed to user
   again.
3) If seq_file buffer overflowed from md_seq_stop(), seq_read_iter()
   doesn't handle this, hence unused devices won't be showed to user.

Fix above problems by print personalities and unused devices in
md_seq_show(), as it used to be.

Fixes: cf1b6d4441ff ("md: simplify md_seq_ops")

Signed-off-by: Yu Kuai <redacted>

Applied to md-6.8 branch. (Yes, I am trying to make some changes to the
branches we use. )

Thanks,
Song