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authorDan Williams <dan.j.williams@intel.com>2009-01-11 00:20:39 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-11 00:20:39 -0800
commit649274d993212e7c23c0cb734572c2311c200872 (patch)
tree84ff8e44e5b44bbe3c388eded5c3e28bf0bd2375 /net
parent47fd23fe8efeea3af4593a8424419df48724eb25 (diff)
downloadlinux-649274d993212e7c23c0cb734572c2311c200872.tar.gz
net_dma: acquire/release dma channels on ifup/ifdown
The recent dmaengine rework removed the capability to remove dma device driver modules while net_dma is active. Rather than notify dmaengine-clients that channels are trying to be removed, we now rely on clients to notify dmaengine when they no longer have a need for channels. Teach net_dma to release channels by taking dmaengine references at netdevice open and dropping references at netdevice close. Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 5f736f1ceea..b715a55cccc 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1088,6 +1088,11 @@ int dev_open(struct net_device *dev)
dev->flags |= IFF_UP;
/*
+ * Enable NET_DMA
+ */
+ dmaengine_get();
+
+ /*
* Initialize multicasting status
*/
dev_set_rx_mode(dev);
@@ -1164,6 +1169,11 @@ int dev_close(struct net_device *dev)
*/
call_netdevice_notifiers(NETDEV_DOWN, dev);
+ /*
+ * Shutdown NET_DMA
+ */
+ dmaengine_put();
+
return 0;
}
@@ -5151,9 +5161,6 @@ static int __init net_dev_init(void)
hotcpu_notifier(dev_cpu_callback, 0);
dst_init();
dev_mcast_init();
- #ifdef CONFIG_NET_DMA
- dmaengine_get();
- #endif
rc = 0;
out:
return rc;