linux-kernel - [PATCH] staging: fsl-dpaa2/eth: Defer probing if no MC portal available

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Date:   Thu,  8 Feb 2018 11:16:54 -0600
From:   Ioana Radulescu <ruxandra.radulescu@....com>
To:     gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        laurentiu.tudor@....com, bogdan.purcareata@....com,
        nipun.gupta@....com
Subject: [PATCH] staging: fsl-dpaa2/eth: Defer probing if no MC portal available

MC portals may not be available at the initial probing attempt
due to dependencies on other modules.

Check the return value of the MC portal allocation function and
defer probing in case it's not available yet. For all other error
cases the behaviour stays the same.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
Suggested-by: Nipun Gupta <nipun.gupta@....com>
---
 drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index 2817e67..e4c2804 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -2440,7 +2440,10 @@ static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
 	err = fsl_mc_portal_allocate(dpni_dev, FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
 				     &priv->mc_io);
 	if (err) {
-		dev_err(dev, "MC portal allocation failed\n");
+		if (err == -ENXIO)
+			err = -EPROBE_DEFER;
+		else
+			dev_err(dev, "MC portal allocation failed\n");
 		goto err_portal_alloc;
 	}
 
-- 
2.7.4