From: Madalin Bucur <madalin.bucur@nxp.com>
Date: Thu, 31 Oct 2019 16:37:59 +0200
Subject: dpaa_eth: register a device link for the qman portal used

Git-commit: e06eea555b878f2c95b498aa1c485250ad30c960
Patch-mainline: v5.5-rc1
References: bsc#1174550

Before this change, unbinding the QMan portals did not trigger a
corresponding unbinding of the dpaa_eth making use of it; the first
QMan portal related operation issued afterwards crashed the kernel.
The device link ensures the dpaa_eth dependency upon the qman portal
used is honoured at the QMan portal removal.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c |    5 +++--
 drivers/soc/fsl/qbman/qman.c                   |    6 ------
 include/soc/fsl/qman.h                         |    7 -------
 3 files changed, 3 insertions(+), 15 deletions(-)

--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -750,7 +750,7 @@ static void dpaa_release_channel(void)
 	qman_release_pool(rx_pool_channel);
 }
 
-static void dpaa_eth_add_channel(u16 channel)
+static void dpaa_eth_add_channel(u16 channel, struct device *dev)
 {
 	u32 pool = QM_SDQCR_CHANNELS_POOL_CONV(channel);
 	const cpumask_t *cpus = qman_affine_cpus();
@@ -760,6 +760,7 @@ static void dpaa_eth_add_channel(u16 cha
 	for_each_cpu(cpu, cpus) {
 		portal = qman_get_affine_portal(cpu);
 		qman_p_static_dequeue_add(portal, pool);
+		qman_start_using_portal(portal, dev);
 	}
 }
 
@@ -2866,7 +2867,7 @@ static int dpaa_eth_probe(struct platfor
 	/* Walk the CPUs with affine portals
 	 * and add this pool channel to each's dequeue mask.
 	 */
-	dpaa_eth_add_channel(priv->channel);
+	dpaa_eth_add_channel(priv->channel, &pdev->dev);
 
 	dpaa_fq_setup(priv, &dpaa_fq_cbs, priv->mac_dev->port[TX]);
 
--- a/drivers/soc/fsl/qbman/qman.c
+++ b/drivers/soc/fsl/qbman/qman.c
@@ -1723,12 +1723,6 @@ int qman_start_using_portal(struct qman_
 }
 EXPORT_SYMBOL(qman_start_using_portal);
 
-void qman_stop_using_portal(struct qman_portal *p, struct device *dev)
-{
-	device_link_remove(dev, p->config->dev);
-}
-EXPORT_SYMBOL(qman_stop_using_portal);
-
 int qman_p_poll_dqrr(struct qman_portal *p, unsigned int limit)
 {
 	return __poll_portal_fast(p, limit);
--- a/include/soc/fsl/qman.h
+++ b/include/soc/fsl/qman.h
@@ -926,13 +926,6 @@ struct qman_portal *qman_get_affine_port
 int qman_start_using_portal(struct qman_portal *p, struct device *dev);
 
 /**
- * qman_stop_using_portal - deregister a device link for the portal user
- * @p: the portal that will no longer be in use
- * @dev: the device that uses the portal
- */
-void qman_stop_using_portal(struct qman_portal *p, struct device *dev);
-
-/**
  * qman_p_poll_dqrr - process DQRR (fast-path) entries
  * @limit: the maximum number of DQRR entries to process
  *