linux-kernel - [PATCH 4/6] staging: dpaa2-ethsw: disable switch ports are probe time

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Date:   Tue, 14 Jul 2020 16:34:29 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH 4/6] staging: dpaa2-ethsw: disable switch ports are probe time

The MC firmware will enable the switch interfaces at DPSW creation
without waiting for an 'ifconfig up' on the switch interfaces. When this
happens, the states held by the Linux software vs the firmware are not
in sync. Make sure to disable the switch ports at probe time to not
encounter this issue.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index a1917842536e..f283ce195c1e 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -1672,6 +1672,10 @@ static int ethsw_probe(struct fsl_mc_device *sw_dev)
 		goto err_free_ports;
 	}
 
+	/* Make sure the switch ports are disabled at probe time */
+	for (i = 0; i < ethsw->sw_attr.num_ifs; i++)
+		dpsw_if_disable(ethsw->mc_io, 0, ethsw->dpsw_handle, i);
+
 	/* Setup IRQs */
 	err = ethsw_setup_irqs(sw_dev);
 	if (err)
-- 
2.25.1