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path: root/drivers/dma/of-dma.c
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Diffstat (limited to 'drivers/dma/of-dma.c')
-rw-r--r--drivers/dma/of-dma.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 1e1f2986e..faae0bfe1 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -240,8 +240,9 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
struct of_phandle_args dma_spec;
struct of_dma *ofdma;
struct dma_chan *chan;
- int count, i;
+ int count, i, start;
int ret_no_channel = -ENODEV;
+ static atomic_t last_index;
if (!np || !name) {
pr_err("%s: not enough information provided\n", __func__);
@@ -259,8 +260,15 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
return ERR_PTR(-ENODEV);
}
+ /*
+ * approximate an average distribution across multiple
+ * entries with the same name
+ */
+ start = atomic_inc_return(&last_index);
for (i = 0; i < count; i++) {
- if (of_dma_match_channel(np, name, i, &dma_spec))
+ if (of_dma_match_channel(np, name,
+ (i + start) % count,
+ &dma_spec))
continue;
mutex_lock(&of_dma_lock);