linux-kernel - [PATCH v4 3/4] dmaengine: ti: k3-udma: Deferring probe when soc_device

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Date:   Tue,  8 Nov 2022 19:11:43 +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 3/4] dmaengine: ti: k3-udma: 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 k3 udma driver and the later returns -ENODEV.
By deferring the k3 udma probe we allow the k3 socinfo to probe and
register the soc_device_attribute structure needed by the k3 udma driver.

Signed-off-by: Nicolas Frayer <nfrayer@...libre.com>
---
 drivers/dma/ti/k3-udma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 7b5081989b3d..a6bb5077900b 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -5285,7 +5285,7 @@ static int udma_probe(struct platform_device *pdev)
 	soc = soc_device_match(k3_soc_devices);
 	if (!soc) {
 		dev_err(dev, "No compatible SoC found\n");
-		return -ENODEV;
+		return -EPROBE_DEFER;
 	}
 	ud->soc_data = soc->data;
 
-- 
2.25.1