net_dma: convert to dma_find_channel

Use the general-purpose channel allocation provided by dmaengine.

Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 0 insertions, 40 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index e40b0d57f8ff..bbb07dbe1740 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4828,44 +4828,6 @@ static int dev_cpu_callback(struct notifier_block *nfb,
 
 #ifdef CONFIG_NET_DMA
 /**
- * net_dma_rebalance - try to maintain one DMA channel per CPU
- * @net_dma: DMA client and associated data (lock, channels, channel_mask)
- *
- * This is called when the number of channels allocated to the net_dma client
- * changes.  The net_dma client tries to have one DMA channel per CPU.
- */
-
-static void net_dma_rebalance(struct net_dma *net_dma)
-{
-        unsigned int cpu, i, n, chan_idx;
-        struct dma_chan *chan;
-
-        if (cpus_empty(net_dma->channel_mask)) {
-                for_each_online_cpu(cpu)
-                        rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
-                return;
-        }
-
-        i = 0;
-        cpu = first_cpu(cpu_online_map);
-
-        for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) {
-                chan = net_dma->channels[chan_idx];
-
-                n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
-                   + (i < (num_online_cpus() %
-                        cpus_weight(net_dma->channel_mask)) ? 1 : 0));
-
-                while(n) {
-                        per_cpu(softnet_data, cpu).net_dma = chan;
-                        cpu = next_cpu(cpu, cpu_online_map);
-                        n--;
-                }
-                i++;
-        }
-}
-
-/**
  * netdev_dma_event - event callback for the net_dma_client
  * @client: should always be net_dma_client
  * @chan: DMA channel for the event
@@ -4894,7 +4856,6 @@ netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
                         ack = DMA_ACK;
                         net_dma->channels[pos] = chan;
                         cpu_set(pos, net_dma->channel_mask);
-                        net_dma_rebalance(net_dma);
                 }
                 break;
         case DMA_RESOURCE_REMOVED:
@@ -4909,7 +4870,6 @@ netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
                         ack = DMA_ACK;
                         cpu_clear(pos, net_dma->channel_mask);
                         net_dma->channels[i] = NULL;
-                        net_dma_rebalance(net_dma);
                 }
                 break;
         default: