ioat3: specify valid address for disabled-Q or disabled-P

Although disabled, hardware still checks address validity, so duplicate
the known address.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 17 insertions, 5 deletions

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 4f305f61f878..fad2e9fba490 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -736,10 +736,16 @@ ioat3_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
               unsigned int src_cnt, const unsigned char *scf, size_t len,
               unsigned long flags)
 {
+        /* specify valid address for disabled result */
+        if (flags & DMA_PREP_PQ_DISABLE_P)
+                dst[0] = dst[1];
+        if (flags & DMA_PREP_PQ_DISABLE_Q)
+                dst[1] = dst[0];
+
         /* handle the single source multiply case from the raid6
          * recovery path
          */
-        if (unlikely((flags & DMA_PREP_PQ_DISABLE_P) && src_cnt == 1)) {
+        if ((flags & DMA_PREP_PQ_DISABLE_P) && src_cnt == 1) {
                 dma_addr_t single_source[2];
                 unsigned char single_source_coef[2];
 
@@ -761,6 +767,12 @@ ioat3_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
                   unsigned int src_cnt, const unsigned char *scf, size_t len,
                   enum sum_check_flags *pqres, unsigned long flags)
 {
+        /* specify valid address for disabled result */
+        if (flags & DMA_PREP_PQ_DISABLE_P)
+                pq[0] = pq[1];
+        if (flags & DMA_PREP_PQ_DISABLE_Q)
+                pq[1] = pq[0];
+
         /* the cleanup routine only sets bits on validate failure, it
          * does not clear bits on validate success... so clear it here
          */
@@ -778,9 +790,9 @@ ioat3_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
         dma_addr_t pq[2];
 
         memset(scf, 0, src_cnt);
-        flags |= DMA_PREP_PQ_DISABLE_Q;
         pq[0] = dst;
-        pq[1] = ~0;
+        flags |= DMA_PREP_PQ_DISABLE_Q;
+        pq[1] = dst; /* specify valid address for disabled result */
 
         return __ioat3_prep_pq_lock(chan, NULL, pq, src, src_cnt, scf, len,
                                     flags);
@@ -800,9 +812,9 @@ ioat3_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
         *result = 0;
 
         memset(scf, 0, src_cnt);
-        flags |= DMA_PREP_PQ_DISABLE_Q;
         pq[0] = src[0];
-        pq[1] = ~0;
+        flags |= DMA_PREP_PQ_DISABLE_Q;
+        pq[1] = pq[0]; /* specify valid address for disabled result */
 
         return __ioat3_prep_pq_lock(chan, result, pq, &src[1], src_cnt - 1, scf,
                                     len, flags);