spi/pxa2xx: initialize DMA channels to -1 to prevent inadvertent match

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@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index cb0e1f1137ad..91815fa2d2fe 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1066,6 +1066,8 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
 
         pdata->num_chipselect = 1;
         pdata->enable_dma = true;
+        pdata->tx_chan_id = -1;
+        pdata->rx_chan_id = -1;
 
         return pdata;
 }