linux-kernel - [PATCH] dmaengine: of: bail out early if "dmas" property is not present

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Date:	Wed, 14 Jan 2015 15:16:28 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	dmaengine@...r.kernel.org
Cc:	linux-sh@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
	Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: of: bail out early if "dmas" property is not present

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

And don't print an error: not configured is not an error.

Reported-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---

In response to Philipp's patch silencing the warning in the driver:
http://patchwork.ozlabs.org/patch/425696/

I think this should be handled in the core.

 drivers/dma/of-dma.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index d5fbeaa1e7ba..ca31f1b45366 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -159,6 +159,10 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
 		return ERR_PTR(-ENODEV);
 	}
 
+	/* Silently fail if there is not even the "dmas" property */
+	if (!of_find_property(np, "dmas", NULL))
+		return ERR_PTR(-ENODEV);
+
 	count = of_property_count_strings(np, "dma-names");
 	if (count < 0) {
 		pr_err("%s: dma-names property of node '%s' missing or empty\n",
-- 
2.1.3

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