linux-kernel - [ 140/150] dma: sh: Dont use ENODEV for failing slave lookup

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Date:	Tue, 26 Feb 2013 15:56:37 -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,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Vinod Koul <vinod.koul@...ux.intel.com>
Subject: [ 140/150] dma: sh: Dont use ENODEV for failing slave lookup

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

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

From: Guennadi Liakhovetski <g.liakhovetski@....de>

commit 7c1119bdd650fa58dad8157bc75c5fcf6ed97843 upstream.

If dmaengine driver's .device_alloc_chan_resources() method returns -ENODEV,
dma_request_channel() will decide, that the driver has been removed and will
remove the device from its list. To prevent this use ENXIO if a slave lookup
fails.

Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@....de>
Signed-off-by: Vinod Koul <vinod.koul@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/sh/shdma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dma/sh/shdma.c
+++ b/drivers/dma/sh/shdma.c
@@ -326,7 +326,7 @@ static int sh_dmae_set_slave(struct shdm
 						    shdma_chan);
 	const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
 	if (!cfg)
-		return -ENODEV;
+		return -ENXIO;
 
 	if (!try)
 		sh_chan->config = cfg;


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