Dan Williams 95475e5711 async_tx: remove walk of tx->parent chain in dma_wait_for_async_tx ... We currently walk the parent chain when waiting for a given tx to complete however this walk may race with the driver cleanup routine. The routines in async_raid6_recov.c may fall back to the synchronous path at any point so we need to be prepared to call async_tx_quiesce() (which calls dma_wait_for_async_tx). To remove the ->parent walk we guarantee that every time a dependency is attached ->issue_pending() is invoked, then we can simply poll the initial descriptor until completion. This also allows for a lighter weight 'issue pending' implementation as there is no longer a requirement to iterate through all the channels' ->issue_pending() routines as long as operations have been submitted in an ordered chain. async_tx_issue_pending() is added for this case. Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2009-08-29 19:09:27 -07:00
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async_memcpy.c	async_tx: kill needless module_{init|exit}	2009-08-29 19:09:26 -07:00
async_memset.c	async_tx: kill needless module_{init|exit}	2009-08-29 19:09:26 -07:00
async_tx.c	async_tx: remove walk of tx->parent chain in dma_wait_for_async_tx	2009-08-29 19:09:27 -07:00
async_xor.c	async_tx: add sum check flags	2009-08-29 19:09:26 -07:00
Kconfig	async_tx: add the async_tx api	2007-07-13 08:06:14 -07:00
Makefile	async_tx: add the async_tx api	2007-07-13 08:06:14 -07:00