linux-kernel - [PATCH 3.13 040/120] spi/pxa2xx: initialize DMA channels to -1 to prevent inadvertent match

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Date:	Tue, 11 Feb 2014 11:04:41 -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,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Mark Brown <broonie@...aro.org>
Subject: [PATCH 3.13 040/120] spi/pxa2xx: initialize DMA channels to -1 to prevent inadvertent match

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

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

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

commit 483c319188c74e82b29a0ed7a7fa7065570f2193 upstream.

Commit cddb339badb0 (spi/pxa2xx: convert to dma_request_slave_channel_compat())
converted the driver to use ACPI provided DMA helpers but it forgot to
initialize the platform data for the channels to -1. Failing to do so will
result inadvertent match in the filter function because 0 is a valid
channel number.

Prevent this from happening by initializing both platform data channels
correctly to -1.

Fixes: cddb339badb0 (spi/pxa2xx: convert to dma_request_slave_channel_compat())
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-pxa2xx.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1066,6 +1066,8 @@ pxa2xx_spi_acpi_get_pdata(struct platfor
 
 	pdata->num_chipselect = 1;
 	pdata->enable_dma = true;
+	pdata->tx_chan_id = -1;
+	pdata->rx_chan_id = -1;
 
 	return pdata;
 }


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