linux-kernel - [net-next PATCH v4 11/13] net: netcp: support probe deferral

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Date:   Tue, 17 Apr 2018 17:30:40 -0400
From:   Murali Karicheri <m-karicheri2@...com>
To:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <ssantosh@...nel.org>, <malat@...ian.org>, <w-kwok2@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <davem@...emloft.net>,
        <netdev@...r.kernel.org>, <grygorii.strashko@...com>,
        <nsekhar@...com>
Subject: [net-next PATCH v4 11/13] net: netcp: support probe deferral

The netcp driver shouldn't proceed until the knav qmss and dma
devices are ready. So return -EPROBE_DEFER if these devices are not
ready.

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 drivers/net/ethernet/ti/netcp_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c
index 9c51b25..736f6f7 100644
--- a/drivers/net/ethernet/ti/netcp_core.c
+++ b/drivers/net/ethernet/ti/netcp_core.c
@@ -2158,6 +2158,10 @@ static int netcp_probe(struct platform_device *pdev)
 	struct netcp_module *module;
 	int ret;
 
+	if (!knav_dma_device_ready() ||
+	    !knav_qmss_device_ready())
+		return -EPROBE_DEFER;
+
 	if (!node) {
 		dev_err(dev, "could not find device info\n");
 		return -ENODEV;
-- 
1.9.1