diff options
Diffstat (limited to 'drivers/dma/of-dma.c')
| -rw-r--r-- | drivers/dma/of-dma.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c index 1e1f2986eba8..faae0bfe1109 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); |