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>
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@ -270,8 +270,18 @@ struct dma_device {
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/* --- public DMA engine API --- */
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/* --- public DMA engine API --- */
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#ifdef CONFIG_DMA_ENGINE
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void dmaengine_get(void);
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void dmaengine_get(void);
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void dmaengine_put(void);
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void dmaengine_put(void);
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#else
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static inline void dmaengine_get(void)
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{
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}
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static inline void dmaengine_put(void)
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{
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}
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#endif
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dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
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dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
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void *dest, void *src, size_t len);
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void *dest, void *src, size_t len);
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dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
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dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
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@ -1087,6 +1087,11 @@ int dev_open(struct net_device *dev)
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*/
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*/
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dev->flags |= IFF_UP;
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dev->flags |= IFF_UP;
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/*
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* Enable NET_DMA
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*/
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dmaengine_get();
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/*
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/*
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* Initialize multicasting status
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* Initialize multicasting status
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*/
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*/
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@ -1164,6 +1169,11 @@ int dev_close(struct net_device *dev)
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*/
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*/
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call_netdevice_notifiers(NETDEV_DOWN, dev);
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call_netdevice_notifiers(NETDEV_DOWN, dev);
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/*
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* Shutdown NET_DMA
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*/
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dmaengine_put();
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return 0;
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return 0;
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}
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}
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@ -5151,9 +5161,6 @@ static int __init net_dev_init(void)
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hotcpu_notifier(dev_cpu_callback, 0);
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hotcpu_notifier(dev_cpu_callback, 0);
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dst_init();
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dst_init();
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dev_mcast_init();
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dev_mcast_init();
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#ifdef CONFIG_NET_DMA
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dmaengine_get();
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#endif
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rc = 0;
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rc = 0;
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out:
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out:
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return rc;
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return rc;
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