async_tx: add sum check flags

Replace the flat zero_sum_result with a collection of flags to contain
the P (xor) zero-sum result, and the soon to be utilized Q (raid6 reed
solomon syndrome) zero-sum result.  Use the SUM_CHECK_ namespace instead
of DMA_ since these flags will be used on non-dma-zero-sum enabled
platforms.

Reviewed-by: Andre Noll <maan@systemlinux.org>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/arch/arm/mach-iop13xx/include/mach/adma.h b/arch/arm/mach-iop13xx/include/mach/adma.h
index 5722e86f217..1cd31df8924 100644
--- a/arch/arm/mach-iop13xx/include/mach/adma.h
+++ b/arch/arm/mach-iop13xx/include/mach/adma.h
@@ -428,18 +428,20 @@ static inline void iop_desc_set_block_fill_val(struct iop_adma_desc_slot *desc,
         hw_desc->block_fill_data = val;
 }
 
-static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
+static inline enum sum_check_flags
+iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
 {
         struct iop13xx_adma_desc_hw *hw_desc = desc->hw_desc;
         struct iop13xx_adma_desc_ctrl desc_ctrl = hw_desc->desc_ctrl_field;
         struct iop13xx_adma_byte_count byte_count = hw_desc->byte_count_field;
+        enum sum_check_flags flags;
 
         BUG_ON(!(byte_count.tx_complete && desc_ctrl.zero_result));
 
-        if (desc_ctrl.pq_xfer_en)
-                return byte_count.zero_result_err_q;
-        else
-                return byte_count.zero_result_err;
+        flags = byte_count.zero_result_err_q << SUM_CHECK_Q;
+        flags |= byte_count.zero_result_err << SUM_CHECK_P;
+
+        return flags;
 }
 
 static inline void iop_chan_append(struct iop_adma_chan *chan)