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    Subject[patch 73/76] async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor
    -stable review patch.  If anyone has any objections, please let us know.
    ---------------------

    From: Dan Williams <dan.j.williams@intel.com>

    If the channel cannot perform the operation in one call to
    ->device_prep_dma_zero_sum, then fallback to the xor+page_is_zero path.
    This only affects users with arrays larger than 16 devices on iop13xx or
    32 devices on iop3xx.

    Cc: <stable@kernel.org>
    Cc: Neil Brown <neilb@suse.de>
    Signed-off-by: Dan Williams <dan.j.williams@intel.com>
    [chrisw@sous-sol.org: backport to 2.6.24.3]
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    please verify the backport makes sense

    crypto/async_tx/async_xor.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/crypto/async_tx/async_xor.c
    +++ b/crypto/async_tx/async_xor.c
    @@ -264,7 +264,7 @@ async_xor_zero_sum(struct page *dest, st

    BUG_ON(src_cnt <= 1);

    - if (tx) {
    + if (tx && src_cnt <= device->max_xor) {
    dma_addr_t dma_addr;
    enum dma_data_direction dir;

    --


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