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authorDan Williams <dan.j.williams@intel.com>2008-07-16 19:44:56 -0700
committerDan Williams <dan.j.williams@intel.com>2008-07-17 17:59:55 -0700
commit1e55db2d6bdef92abc981b68673564e63c80da4d (patch)
treeac3cd7c249735772df8c08b1d803563bad854527 /include
parent20fc190b0ef58bf8b3b0bff9de122083956f82ec (diff)
async_tx: ensure the xor destination buffer remains dma-mapped
When the number of source buffers for an xor operation exceeds the hardware channel maximum async_xor creates a chain of dependent operations. The result of one operation is reused as an input to the next to continue the xor calculation. The destination buffer should remain mapped for the duration of the entire chain. To provide this guarantee the code must no longer be allowed to fallback to the synchronous path as this will preclude the buffer from being unmapped, i.e. the dma-driver will potentially miss the descriptor with !DMA_COMPL_SKIP_DEST_UNMAP. Cc: Neil Brown <neilb@suse.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include')
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