linux-kernel - [PATCH AUTOSEL 5.4 10/14] dm table: Remove BUG_ON(in

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Date:   Sat, 12 Dec 2020 11:08:27 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Mike Snitzer <snitzer@...hat.com>,
        Sasha Levin <sashal@...nel.org>, dm-devel@...hat.com,
        linux-raid@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 10/14] dm table: Remove BUG_ON(in_interrupt())

From: Thomas Gleixner <tglx@...utronix.de>

[ Upstream commit e7b624183d921b49ef0a96329f21647d38865ee9 ]

The BUG_ON(in_interrupt()) in dm_table_event() is a historic leftover from
a rework of the dm table code which changed the calling context.

Issuing a BUG for a wrong calling context is frowned upon and
in_interrupt() is deprecated and only covering parts of the wrong
contexts. The sanity check for the context is covered by
CONFIG_DEBUG_ATOMIC_SLEEP and other debug facilities already.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/md/dm-table.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 13ad791126618..6dd56afa048c2 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1320,12 +1320,6 @@ void dm_table_event_callback(struct dm_table *t,
 
 void dm_table_event(struct dm_table *t)
 {
-	/*
-	 * You can no longer call dm_table_event() from interrupt
-	 * context, use a bottom half instead.
-	 */
-	BUG_ON(in_interrupt());
-
 	mutex_lock(&_event_lock);
 	if (t->event_fn)
 		t->event_fn(t->event_context);
-- 
2.27.0