linux-kernel - [PATCH 4.19 18/73] scsi: zfcp: fix missing zfcp_port reference put on -EBUSY from port

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Message-Id: <20190607153850.958139599@linuxfoundation.org>
Date:   Fri,  7 Jun 2019 17:39:05 +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, Steffen Maier <maier@...ux.ibm.com>,
        Jens Remus <jremus@...ux.ibm.com>,
        Benjamin Block <bblock@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.19 18/73] scsi: zfcp: fix missing zfcp_port reference put on -EBUSY from port_remove

From: Steffen Maier <maier@...ux.ibm.com>

commit d27e5e07f9c49bf2a6a4ef254ce531c1b4fb5a38 upstream.

With this early return due to zfcp_unit child(ren), we don't use the
zfcp_port reference from the earlier zfcp_get_port_by_wwpn() anymore and
need to put it.

Signed-off-by: Steffen Maier <maier@...ux.ibm.com>
Fixes: d99b601b6338 ("[SCSI] zfcp: restore refcount check on port_remove")
Cc: <stable@...r.kernel.org> #3.7+
Reviewed-by: Jens Remus <jremus@...ux.ibm.com>
Reviewed-by: Benjamin Block <bblock@...ux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/s390/scsi/zfcp_sysfs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -261,6 +261,7 @@ static ssize_t zfcp_sysfs_port_remove_st
 	if (atomic_read(&port->units) > 0) {
 		retval = -EBUSY;
 		mutex_unlock(&zfcp_sysfs_port_units_mutex);
+		put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
 		goto out;
 	}
 	/* port is about to be removed, so no more unit_add */