[PATCH] nvme-tcp: Use __dev_get_by_name instead dev_get_by_name for OPT_HOST_IFACE

[Prabhakar Kushwaha]

dev_get_by_name() finds network device by name but it also increases
reference count.
Increasing the ref count,
If nvme-tcp queue is present and the network device driver is removed
before nvme_tcp, we will face the following continuous log:
  "kernel:unregister_netdevice: waiting for <eth> to become
  free. Usage count = 2"
And rmmod further halts. Similar case arises during reboot/shutdown
with nvme-tcp queue present and both never completes.

As a fix we will use __dev_get_by_name() which find network device by
name without increasing any reference counter.

Signed-off-by: Omkar Kulkarni <okulkarni at marvell.com>
Signed-off-by: Shai Malin <smalin at marvell.com>
Signed-off-by: Prabhakar Kushwaha <pkushwaha at marvell.com>
---
 drivers/nvme/host/tcp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index c7bd37103cf4..f9b527e71c13 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2533,7 +2533,7 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 	}
 
 	if (opts->mask & NVMF_OPT_HOST_IFACE) {
-		ctrl->ndev = dev_get_by_name(&init_net, opts->host_iface);
+		ctrl->ndev = __dev_get_by_name(&init_net, opts->host_iface);
 		if (!ctrl->ndev) {
 			pr_err("invalid interface passed: %s\n",
 			       opts->host_iface);
-- 
2.30.1