netdev - [PATCH net] dpaa2-eth: free already allocated channels on probe defer

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Date:   Mon, 11 Nov 2019 11:40:55 +0200
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH net] dpaa2-eth: free already allocated channels on probe defer

The setup_dpio() function tries to allocate a number of channels equal
to the number of CPUs online. When there are no enough DPCON objects
already probed, the function will return EPROBE_DEFER. When this
happens, the already allocated channels are not freed. This results in
the incapacity of properly probing the next time around.
Fix this by freeing the channels on the error path.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 19379bae0144..22e9519f65bb 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -2232,6 +2232,14 @@ static int setup_dpio(struct dpaa2_eth_priv *priv)
 err_service_reg:
 	free_channel(priv, channel);
 err_alloc_ch:
+	for (i = 0; i < priv->num_channels; i++) {
+		channel = priv->channel[i];
+		nctx = &channel->nctx;
+		dpaa2_io_service_deregister(channel->dpio, nctx, dev);
+		free_channel(priv, channel);
+	}
+	priv->num_channels = 0;
+
 	if (err == -EPROBE_DEFER)
 		return err;
 
-- 
1.9.1