dmaengine: ioatdma: Fix variable array length

Sparse reported:
drivers/dma/ioat/prep.c:637:27: sparse: Variable length array is used.

Assigning a static value for the array.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/dma/ioat/prep.c b/drivers/dma/ioat/prep.c
index e323a4036908..ad4fb41cd23b 100644
--- a/drivers/dma/ioat/prep.c
+++ b/drivers/dma/ioat/prep.c
@@ -26,6 +26,8 @@
 #include "hw.h"
 #include "dma.h"
 
+#define MAX_SCF 1024
+
 /* provide a lookup table for setting the source address in the base or
  * extended descriptor of an xor or pq descriptor
  */
@@ -634,9 +636,12 @@ struct dma_async_tx_descriptor *
 ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
                  unsigned int src_cnt, size_t len, unsigned long flags)
 {
-        unsigned char scf[src_cnt];
+        unsigned char scf[MAX_SCF];
         dma_addr_t pq[2];
 
+        if (src_cnt > MAX_SCF)
+                return NULL;
+
         memset(scf, 0, src_cnt);
         pq[0] = dst;
         flags |= DMA_PREP_PQ_DISABLE_Q;
@@ -654,9 +659,12 @@ ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
                      unsigned int src_cnt, size_t len,
                      enum sum_check_flags *result, unsigned long flags)
 {
-        unsigned char scf[src_cnt];
+        unsigned char scf[MAX_SCF];
         dma_addr_t pq[2];
 
+        if (src_cnt > MAX_SCF)
+                return NULL;
+
         /* the cleanup routine only sets bits on validate failure, it
          * does not clear bits on validate success... so clear it here
          */