linux-kernel - [PATCH AUTOSEL 4.9 4/5] scsi: core: Only put parent device if host state differs from SHOST

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Date:   Tue, 15 Jun 2021 11:50:38 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ming Lei <ming.lei@...hat.com>,
        Bart Van Assche <bvanassche@....org>,
        John Garry <john.garry@...wei.com>,
        Hannes Reinecke <hare@...e.de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 4/5] scsi: core: Only put parent device if host state differs from SHOST_CREATED

From: Ming Lei <ming.lei@...hat.com>

[ Upstream commit 1e0d4e6225996f05271de1ebcb1a7c9381af0b27 ]

get_device(shost->shost_gendev.parent) is called after host state has
switched to SHOST_RUNNING. scsi_host_dev_release() shouldn't release the
parent device if host state is still SHOST_CREATED.

Link: https://lore.kernel.org/r/20210602133029.2864069-5-ming.lei@redhat.com
Cc: Bart Van Assche <bvanassche@....org>
Cc: John Garry <john.garry@...wei.com>
Cc: Hannes Reinecke <hare@...e.de>
Tested-by: John Garry <john.garry@...wei.com>
Reviewed-by: John Garry <john.garry@...wei.com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/hosts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index a44967436253..604cf3385aae 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -372,7 +372,7 @@ static void scsi_host_dev_release(struct device *dev)
 
 	ida_simple_remove(&host_index_ida, shost->host_no);
 
-	if (parent)
+	if (shost->shost_state != SHOST_CREATED)
 		put_device(parent);
 	kfree(shost);
 }
-- 
2.30.2