linux-kernel - [PATCH 4.19 188/361] dmaengine: dma-jz4780: Return error if not probed from DT

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Date:   Sun, 11 Nov 2018 14:18:55 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 188/361] dmaengine: dma-jz4780: Return error if not probed from DT

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Cercueil <paul@...pouillou.net>

[ Upstream commit 54f919a04cf221bc1601d1193682d4379dacacbd ]

The driver calls clk_get() with the clock name set to NULL, which means
that the driver could only work when probed from devicetree. From now
on, we explicitly require the driver to be probed from devicetree.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Tested-by: Mathieu Malaterre <malat@...ian.org>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma/dma-jz4780.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -761,6 +761,11 @@ static int jz4780_dma_probe(struct platf
 	struct resource *res;
 	int i, ret;
 
+	if (!dev->of_node) {
+		dev_err(dev, "This driver must be probed from devicetree\n");
+		return -EINVAL;
+	}
+
 	jzdma = devm_kzalloc(dev, sizeof(*jzdma), GFP_KERNEL);
 	if (!jzdma)
 		return -ENOMEM;