Initialize default channel slave_id(req_sel) to invalid id
(i.e max supported slave id + 1) to avoid overwriting of slave_id
during tegra_dma_slave_config() with client data if slave_id
is not initialized through DT
Signed-off-by: Shardar Shariff Md <smohammed@xxxxxxxxxx>
---
- Instead of initializing the slave id to -1 define macros for
max slave id and invalid slave id and do the checks accordingly.
---
drivers/dma/tegra20-apb-dma.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 3871f29..2957e26 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -114,6 +114,9 @@
/* Channel base address offset from APBDMA base address */
#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
+#define TEGRA_APBDMA_SLAVE_ID_MAX 31
+#define TEGRA_APBDMA_SLAVE_ID_INVALID (TEGRA_APBDMA_SLAVE_ID_MAX + 1)
+
struct tegra_dma;
/*
@@ -353,7 +356,7 @@ 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 == TEGRA_APBDMA_SLAVE_ID_INVALID)
tdc->slave_id = sconfig->slave_id;
tdc->config_init = true;
return 0;
@@ -1236,7 +1239,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
}
pm_runtime_put(tdma->dev);
- tdc->slave_id = 0;
+ tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
}
static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
@@ -1253,6 +1256,11 @@ static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
tdc = to_tegra_dma_chan(chan);
tdc->slave_id = dma_spec->args[0];
+ if (tdc->slave_id > TEGRA_APBDMA_SLAVE_ID_MAX) {
+ dev_err(tdc2dev(tdc), "Invalid slave id\n");
+ return NULL;
+ }
+
return chan;
}
@@ -1389,6 +1397,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
&tdma->dma_dev.channels);
tdc->tdma = tdma;
tdc->id = i;
+ tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
(unsigned long)tdc);
--
1.8.1.5
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