From: James Smart <jsmart2021@gmail.com>
Date: Tue, 19 Sep 2017 22:13:11 +0000 (-0700)
Subject: nvmet-fc: on port remove call put outside lock
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3688feb582a1bc4e58ad50f5eccfdb90615de27b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

nvmet-fc: on port remove call put outside lock

Avoid calling the put routine, as it may traverse to free routines while
holding the target lock.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index c48c83d97e30..6850672ad2a2 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -2530,13 +2530,17 @@ nvmet_fc_remove_port(struct nvmet_port *port)
 {
 	struct nvmet_fc_tgtport *tgtport = port->priv;
 	unsigned long flags;
+	bool matched = false;
 
 	spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
 	if (tgtport->port == port) {
-		nvmet_fc_tgtport_put(tgtport);
+		matched = true;
 		tgtport->port = NULL;
 	}
 	spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+	if (matched)
+		nvmet_fc_tgtport_put(tgtport);
 }
 
 static struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {