linux-kernel - [PATCH v4 4/4] net: ethernet: ti: davinci_mdio: Deferring probe when soc_device

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Date:   Tue,  8 Nov 2022 19:11:44 +0100
From:   Nicolas Frayer <nfrayer@...libre.com>
To:     nm@...com, ssantosh@...nel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, peter.ujfalusi@...il.com,
        vkoul@...nel.org, dmaengine@...r.kernel.org,
        grygorii.strashko@...com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux-omap@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     khilman@...libre.com, glaroque@...libre.com, nfrayer@...libre.com
Subject: [PATCH v4 4/4] net: ethernet: ti: davinci_mdio: Deferring probe when soc_device_match() returns NULL

When the k3 socinfo driver is built as a module, there is a possibility
that it will probe after the davinci mdio driver. By deferring the mdio
probe we allow the k3 socinfo to probe and register the
soc_device_attribute structure needed by the mdio driver.

Signed-off-by: Nicolas Frayer <nfrayer@...libre.com>
---
 drivers/net/ethernet/ti/davinci_mdio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 946b9753ccfb..095198b6b7be 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -533,6 +533,10 @@ static int davinci_mdio_probe(struct platform_device *pdev)
 		const struct soc_device_attribute *soc_match_data;
 
 		soc_match_data = soc_device_match(k3_mdio_socinfo);
+
+		if (!soc_match_data)
+			return -EPROBE_DEFER;
+
 		if (soc_match_data && soc_match_data->data) {
 			const struct k3_mdio_soc_data *socdata =
 						soc_match_data->data;
-- 
2.25.1