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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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12
crypto/async_tx/async_tx.c
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@@ -45,18 +45,6 @@ static DEFINE_SPINLOCK(async_tx_lock);
static LIST_HEAD(async_tx_master_list);
/* async_tx_issue_pending_all - start all transactions on all channels */
void async_tx_issue_pending_all(void)
{
struct dma_chan_ref *ref;
rcu_read_lock();
list_for_each_entry_rcu(ref, &async_tx_master_list, node)
ref->chan->device->device_issue_pending(ref->chan);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(async_tx_issue_pending_all);
static void
free_dma_chan_ref(struct rcu_head *rcu)
{