md/async: don't pass a memory pointer as a page pointer.

md/raid6 passes a list of 'struct page *' to the async_tx routines,
which then either DMA map them for offload, or take the page_address
for CPU based calculations.

For RAID6 we sometime leave 'blanks' in the list of pages.
For CPU based calcs, we want to treat theses as a page of zeros.
For offloaded calculations, we simply don't pass a page to the
hardware.

Currently the 'blanks' are encoded as a pointer to
raid6_empty_zero_page.  This is a 4096 byte memory region, not a
'struct page'.  This is mostly handled correctly but is rather ugly.

So change the code to pass and expect a NULL pointer for the blanks.
When taking page_address of a page, we need to check for a NULL and
in that case use raid6_empty_zero_page.

Signed-off-by: NeilBrown <neilb@suse.de>

2 files changed, 15 insertions, 16 deletions

diff --git a/crypto/async_tx/async_pq.c b/crypto/async_tx/async_pq.c
index b88db6d1dc65..9ab1ce4af3cc 100644
--- a/crypto/async_tx/async_pq.c
+++ b/crypto/async_tx/async_pq.c
@@ -30,11 +30,6 @@
  */
 static struct page *scribble;
 
-static bool is_raid6_zero_block(struct page *p)
-{
-        return p == (void *) raid6_empty_zero_page;
-}
-
 /* the struct page *blocks[] parameter passed to async_gen_syndrome()
  * and async_syndrome_val() contains the 'P' destination address at
  * blocks[disks-2] and the 'Q' destination address at blocks[disks-1]
@@ -83,7 +78,7 @@ do_async_gen_syndrome(struct dma_chan *chan, struct page **blocks,
          * sources and update the coefficients accordingly
          */
         for (i = 0, idx = 0; i < src_cnt; i++) {
-                if (is_raid6_zero_block(blocks[i]))
+                if (blocks[i] == NULL)
                         continue;
                 dma_src[idx] = dma_map_page(dma->dev, blocks[i], offset, len,
                                             DMA_TO_DEVICE);
@@ -160,9 +155,9 @@ do_sync_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
                 srcs = (void **) blocks;
 
         for (i = 0; i < disks; i++) {
-                if (is_raid6_zero_block(blocks[i])) {
+                if (blocks[i] == NULL) {
                         BUG_ON(i > disks - 3); /* P or Q can't be zero */
-                        srcs[i] = blocks[i];
+                        srcs[i] = (void*)raid6_empty_zero_page;
                 } else
                         srcs[i] = page_address(blocks[i]) + offset;
         }
@@ -290,12 +285,10 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
                 if (submit->flags & ASYNC_TX_FENCE)
                         dma_flags |= DMA_PREP_FENCE;
                 for (i = 0; i < disks; i++)
-                        if (likely(blocks[i])) {
-                                BUG_ON(is_raid6_zero_block(blocks[i]));
+                        if (likely(blocks[i]))
                                 dma_src[i] = dma_map_page(dev, blocks[i],
                                                           offset, len,
                                                           DMA_TO_DEVICE);
-                        }
 
                 for (;;) {
                         tx = device->device_prep_dma_pq_val(chan, pq, dma_src,
diff --git a/crypto/async_tx/async_raid6_recov.c b/crypto/async_tx/async_raid6_recov.c
index 6d73dde4786d..8e30b6ed0789 100644
--- a/crypto/async_tx/async_raid6_recov.c
+++ b/crypto/async_tx/async_raid6_recov.c
@@ -263,10 +263,10 @@ __2data_recov_n(int disks, size_t bytes, int faila, int failb,
          * delta p and delta q
          */
         dp = blocks[faila];
-        blocks[faila] = (void *)raid6_empty_zero_page;
+        blocks[faila] = NULL;
         blocks[disks-2] = dp;
         dq = blocks[failb];
-        blocks[failb] = (void *)raid6_empty_zero_page;
+        blocks[failb] = NULL;
         blocks[disks-1] = dq;
 
         init_async_submit(submit, ASYNC_TX_FENCE, tx, NULL, NULL, scribble);
@@ -338,7 +338,10 @@ async_raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
 
                 async_tx_quiesce(&submit->depend_tx);
                 for (i = 0; i < disks; i++)
-                        ptrs[i] = page_address(blocks[i]);
+                        if (blocks[i] == NULL)
+                                ptrs[i] = (void*)raid6_empty_zero_page;
+                        else
+                                ptrs[i] = page_address(blocks[i]);
 
                 raid6_2data_recov(disks, bytes, faila, failb, ptrs);
 
@@ -398,7 +401,10 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
 
                 async_tx_quiesce(&submit->depend_tx);
                 for (i = 0; i < disks; i++)
-                        ptrs[i] = page_address(blocks[i]);
+                        if (blocks[i] == NULL)
+                                ptrs[i] = (void*)raid6_empty_zero_page;
+                        else
+                                ptrs[i] = page_address(blocks[i]);
 
                 raid6_datap_recov(disks, bytes, faila, ptrs);
 
@@ -414,7 +420,7 @@ async_raid6_datap_recov(int disks, size_t bytes, int faila,
          * Use the dead data page as temporary storage for delta q
          */
         dq = blocks[faila];
-        blocks[faila] = (void *)raid6_empty_zero_page;
+        blocks[faila] = NULL;
         blocks[disks-1] = dq;
 
         /* in the 4 disk case we only need to perform a single source