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dmaengine: provide a common 'issue_pending_all' implementation

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async_tx and net_dma each have open-coded versions of issue_pending_all,
so provide a common routine in dmaengine.

The implementation needs to walk the global device list, so implement
rcu to allow dma_issue_pending_all to run lockless.  Clients protect
themselves from channel removal events by holding a dmaengine reference.

Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2009-01-06 11:38:14 -07:00
parent bec085134e
commit 2ba05622b8
5 changed files with 27 additions and 24 deletions
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9
net/core/dev.c
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@@ -2635,14 +2635,7 @@ out:
* There may not be any more sk_buffs coming right now, so push
* any pending DMA copies to hardware
*/
if (!cpus_empty(net_dma.channel_mask)) {
int chan_idx;
for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) {
struct dma_chan *chan = net_dma.channels[chan_idx];
if (chan)
dma_async_memcpy_issue_pending(chan);
}
}
dma_issue_pending_all();
#endif
return;