netdev - [PATCH net-next 1/2] dpaa2-eth: defer probe on object allocate

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Date:   Thu, 8 Nov 2018 13:17:47 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH net-next 1/2] dpaa2-eth: defer probe on object allocate

The fsl_mc_object_allocate function can fail because not all allocatable
objects are probed by the fsl_mc_allocator at the call time. Defer the
dpaa2-eth probe when this happens.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 30 +++++++++++++++++-------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 88f7acc..71f5cd4 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -1434,8 +1434,11 @@ static struct fsl_mc_device *setup_dpcon(struct dpaa2_eth_priv *priv)
 	err = fsl_mc_object_allocate(to_fsl_mc_device(dev),
 				     FSL_MC_POOL_DPCON, &dpcon);
 	if (err) {
-		dev_info(dev, "Not enough DPCONs, will go on as-is\n");
-		return NULL;
+		if (err == -ENXIO)
+			err = -EPROBE_DEFER;
+		else
+			dev_info(dev, "Not enough DPCONs, will go on as-is\n");
+		return ERR_PTR(err);
 	}
 
 	err = dpcon_open(priv->mc_io, 0, dpcon->obj_desc.id, &dpcon->mc_handle);
@@ -1493,8 +1496,10 @@ static void free_dpcon(struct dpaa2_eth_priv *priv,
 		return NULL;
 
 	channel->dpcon = setup_dpcon(priv);
-	if (!channel->dpcon)
+	if (IS_ERR_OR_NULL(channel->dpcon)) {
+		err = PTR_ERR(channel->dpcon);
 		goto err_setup;
+	}
 
 	err = dpcon_get_attributes(priv->mc_io, 0, channel->dpcon->mc_handle,
 				   &attr);
@@ -1513,7 +1518,7 @@ static void free_dpcon(struct dpaa2_eth_priv *priv,
 	free_dpcon(priv, channel->dpcon);
 err_setup:
 	kfree(channel);
-	return NULL;
+	return ERR_PTR(err);
 }
 
 static void free_channel(struct dpaa2_eth_priv *priv,
@@ -1547,10 +1552,11 @@ static int setup_dpio(struct dpaa2_eth_priv *priv)
 	for_each_online_cpu(i) {
 		/* Try to allocate a channel */
 		channel = alloc_channel(priv);
-		if (!channel) {
-			dev_info(dev,
-				 "No affine channel for cpu %d and above\n", i);
-			err = -ENODEV;
+		if (IS_ERR_OR_NULL(channel)) {
+			err = PTR_ERR(channel);
+			if (err != -EPROBE_DEFER)
+				dev_info(dev,
+					 "No affine channel for cpu %d and above\n", i);
 			goto err_alloc_ch;
 		}
 
@@ -1608,6 +1614,9 @@ static int setup_dpio(struct dpaa2_eth_priv *priv)
 err_service_reg:
 	free_channel(priv, channel);
 err_alloc_ch:
+	if (err == -EPROBE_DEFER)
+		return err;
+
 	if (cpumask_empty(&priv->dpio_cpumask)) {
 		dev_err(dev, "No cpu with an affine DPIO/DPCON\n");
 		return err;
@@ -1732,7 +1741,10 @@ static int setup_dpbp(struct dpaa2_eth_priv *priv)
 	err = fsl_mc_object_allocate(to_fsl_mc_device(dev), FSL_MC_POOL_DPBP,
 				     &dpbp_dev);
 	if (err) {
-		dev_err(dev, "DPBP device allocation failed\n");
+		if (err == -ENXIO)
+			err = -EPROBE_DEFER;
+		else
+			dev_err(dev, "DPBP device allocation failed\n");
 		return err;
 	}
 
-- 
1.9.1