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author | Dan Williams <dan.j.williams@intel.com> | 2009-07-14 19:19:02 (GMT) |
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committer | Dan Williams <dan.j.williams@intel.com> | 2009-08-30 02:09:27 (GMT) |
commit | 95475e57113c66aac7583925736ed2e2d58c990d (patch) | |
tree | 933aa0ca3bffef5b1457c516fbe3e8690b4c4cb1 /kernel/time | |
parent | af1f951eb6ef27b01cbfb3f6c21b770af4368a6d (diff) | |
download | linux-95475e57113c66aac7583925736ed2e2d58c990d.tar.xz |
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>
Diffstat (limited to 'kernel/time')
0 files changed, 0 insertions, 0 deletions