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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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2
include/linux/async_tx.h
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@ -59,7 +59,7 @@ enum async_tx_flags {
};
#ifdef CONFIG_DMA_ENGINE
void async_tx_issue_pending_all(void);
#define async_tx_issue_pending_all dma_issue_pending_all
#ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
#include <asm/async_tx.h>
#else