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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Randy Dunlap <rdunlap@infradead.org>,
        Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.0 18/93] paride/pf: cleanup queues when detection fails
Date:   Thu, 18 Apr 2019 19:56:56 +0200
Message-Id: <20190418160438.663257972@linuxfoundation.org>
In-Reply-To: <20190418160436.781762249@linuxfoundation.org>
References: <20190418160436.781762249@linuxfoundation.org>
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[ Upstream commit 6ce59025f1182125e75c8d121daf44056b65dd1f ]

The driver allocates queues for all the units it potentially
supports. But if we fail to detect any drives, then we fail
loading the module without cleaning up those queues. This is
now evident with the switch to blk-mq, though the bug has
been there forever as far as I can tell.

Also fix cleanup through regular module exit.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/block/paride/pf.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index e92e7a8eeeb2..103b617cdc31 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -761,8 +761,12 @@ static int pf_detect(void)
 		return 0;
 
 	printk("%s: No ATAPI disk detected\n", name);
-	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++)
+	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
+		blk_cleanup_queue(pf->disk->queue);
+		pf->disk->queue = NULL;
+		blk_mq_free_tag_set(&pf->tag_set);
 		put_disk(pf->disk);
+	}
 	pi_unregister_driver(par_drv);
 	return -1;
 }
@@ -1047,13 +1051,15 @@ static void __exit pf_exit(void)
 	int unit;
 	unregister_blkdev(major, name);
 	for (pf = units, unit = 0; unit < PF_UNITS; pf++, unit++) {
-		if (!pf->present)
-			continue;
-		del_gendisk(pf->disk);
+		if (pf->present)
+			del_gendisk(pf->disk);
+
 		blk_cleanup_queue(pf->disk->queue);
 		blk_mq_free_tag_set(&pf->tag_set);
 		put_disk(pf->disk);
-		pi_release(pf->pi);
+
+		if (pf->present)
+			pi_release(pf->pi);
 	}
 }
 
-- 
2.19.1