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| author | Anup Patel <anup.patel@broadcom.com> | 2017-10-03 08:22:58 +0300 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2017-10-23 09:05:47 +0300 |
| commit | 4e9f8187aecb00d90ec385f5061c91549103a3cf (patch) | |
| tree | 88486f2e78bdf3419a6d94c1673b60f2196ea52e /fs/fs-writeback.c | |
| parent | 5d74aa7f641a8bf778b87941ae6a955121f64f7d (diff) | |
| download | linux-4e9f8187aecb00d90ec385f5061c91549103a3cf.tar.xz | |
dmaengine: bcm-sba-raid: Use only single mailbox channel
Each mailbox channel used by Broadcom SBA RAID driver is
a separate HW ring.
Currently, Broadcom SBA RAID driver creates one DMA channel
using one or more mailbox channels. When we are using more
than one mailbox channels for a DMA channel, the sba_request
are distributed evenly among multiple mailbox channels which
results in sba_request being completed out-of-order.
The above described out-of-order completion of sba_request
breaks the dma_async_is_complete() API because it assumes
DMA cookies are completed in orderly fashion.
To ensure correct behaviour of dma_async_is_complete() API,
this patch updates Broadcom SBA RAID driver to use only
single mailbox channel. If additional mailbox channels are
specified in DT then those will be ignored.
Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'fs/fs-writeback.c')
0 files changed, 0 insertions, 0 deletions