[PATCH] dmaengine: tegra-apb: proper default init of channel slave_id

[Shardar Shariff Md]

Initialize default channel slave_id(req_sel) to -1 to avoid
overwriting of slave_id with client data as zero is the
valid slave_id(request_select).

Signed-off-by: Shardar Shariff Md <smoham...@nvidia.com>
---
 drivers/dma/tegra20-apb-dma.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 3871f29..35a0df0 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -204,7 +204,7 @@ struct tegra_dma_channel {
        struct tasklet_struct   tasklet;
 
        /* Channel-slave specific configuration */
-       unsigned int slave_id;
+       int slave_id;
        struct dma_slave_config dma_sconfig;
        struct tegra_dma_channel_regs   channel_reg;
 };
@@ -353,7 +353,7 @@ static int tegra_dma_slave_config(struct dma_chan *dc,
        }
 
        memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
-       if (!tdc->slave_id)
+       if (tdc->slave_id == -1)
                tdc->slave_id = sconfig->slave_id;
        tdc->config_init = true;
        return 0;
@@ -1236,7 +1236,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan 
*dc)
        }
        pm_runtime_put(tdma->dev);
 
-       tdc->slave_id = 0;
+       tdc->slave_id = -1;
 }
 
 static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
@@ -1389,6 +1389,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
                                &tdma->dma_dev.channels);
                tdc->tdma = tdma;
                tdc->id = i;
+               tdc->slave_id = -1;
 
                tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
                                (unsigned long)tdc);
-- 
1.8.1.5