linux-kernel - [PATCH 4.19 85/88] dm: interlock pending dm_io and dm_wait_for_bios

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Date:   Tue, 10 May 2022 15:08:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>
Subject: [PATCH 4.19 85/88] dm: interlock pending dm_io and dm_wait_for_bios_completion

From: Mike Snitzer <snitzer@...hat.com>

commit 9f6dc633761006f974701d4c88da71ab68670749 upstream.

Commit d208b89401e0 ("dm: fix mempool NULL pointer race when
completing IO") didn't go far enough.

When bio_end_io_acct ends the count of in-flight I/Os may reach zero
and the DM device may be suspended. There is a possibility that the
suspend races with dm_stats_account_io.

Fix this by adding percpu "pending_io" counters to track outstanding
dm_io. Move kicking of suspend queue to dm_io_dec_pending(). Also,
rename md_in_flight_bios() to dm_in_flight_bios() and update it to
iterate all pending_io counters.

Fixes: d208b89401e0 ("dm: fix mempool NULL pointer race when completing IO")
Cc: stable@...r.kernel.org
Co-developed-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Reviewed-by: Mike Snitzer <snitzer@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/dm.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2475,6 +2475,8 @@ static int dm_wait_for_completion(struct
 	}
 	finish_wait(&md->wait, &wait);
 
+	smp_rmb(); /* paired with atomic_dec_return in end_io_acct */
+
 	return r;
 }