linux-kernel - [PATCH RESEND 2/2] scsi: libfc: drop extra rport reference in fc_rport

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Date:   Tue, 14 Jan 2020 14:43:20 +0000
From:   Igor Druzhinin <igor.druzhinin@...rix.com>
To:     <fcoe-devel@...n-fcoe.org>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <hare@...e.de>
CC:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        Igor Druzhinin <igor.druzhinin@...rix.com>
Subject: [PATCH RESEND 2/2] scsi: libfc: drop extra rport reference in fc_rport_create()

The callers of this function seem to assume the reference is not taken
in case rport already exists. This results in one extra reference taken
on each rport re-discovery that will eventually get to inability to
free rport structure on port removal.

Signed-off-by: Igor Druzhinin <igor.druzhinin@...rix.com>
---
 drivers/scsi/libfc/fc_rport.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index da6e97d..a43f9dd 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -133,8 +133,10 @@ struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id)
 	lockdep_assert_held(&lport->disc.disc_mutex);
 
 	rdata = fc_rport_lookup(lport, port_id);
-	if (rdata)
+	if (rdata) {
+		kref_put(&rdata->kref, fc_rport_destroy);
 		return rdata;
+	}
 
 	if (lport->rport_priv_size > 0)
 		rport_priv_size = lport->rport_priv_size;
-- 
2.7.4