linux-kernel - [PATCH 4.9 40/42] scsi: core: Only put parent device if host state differs from SHOST

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Message-Id: <20210614102643.986990916@linuxfoundation.org>
Date:   Mon, 14 Jun 2021 12:27:31 +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, Bart Van Assche <bvanassche@....org>,
        John Garry <john.garry@...wei.com>,
        Hannes Reinecke <hare@...e.de>, Ming Lei <ming.lei@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.9 40/42] scsi: core: Only put parent device if host state differs from SHOST_CREATED

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

commit 1e0d4e6225996f05271de1ebcb1a7c9381af0b27 upstream.

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/hosts.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -368,7 +368,7 @@ static void scsi_host_dev_release(struct
 
 	ida_simple_remove(&host_index_ida, shost->host_no);
 
-	if (parent)
+	if (shost->shost_state != SHOST_CREATED)
 		put_device(parent);
 	kfree(shost);
 }