ioat3: fix uninitialized var warnings

drivers/dma/ioat/dma_v3.c: In function 'ioat3_prep_memset_lock':
drivers/dma/ioat/dma_v3.c:439: warning: 'fill' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:437: warning: 'desc' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_xor_lock':
drivers/dma/ioat/dma_v3.c:489: warning: 'xor' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:486: warning: 'desc' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_pq_lock':
drivers/dma/ioat/dma_v3.c:631: warning: 'pq' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:628: warning: 'desc' may be used uninitialized in this function

gcc-4.0, unlike gcc-4.3, does not see that these variables are
initialized before use.  Convert the descriptor loops to do-while make
this initialization apparent.

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

1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 3686dddf6bff..35d1e33afd5b 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -448,7 +448,8 @@ ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value,
                 /* pass */;
         else
                 return NULL;
-        for (i = 0; i < num_descs; i++) {
+        i = 0;
+        do {
                 size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log);
 
                 desc = ioat2_get_ring_ent(ioat, idx + i);
@@ -463,7 +464,7 @@ ioat3_prep_memset_lock(struct dma_chan *c, dma_addr_t dest, int value,
                 len -= xfer_size;
                 dest += xfer_size;
                 dump_desc_dbg(ioat, desc);
-        }
+        } while (++i < num_descs);
 
         desc->txd.flags = flags;
         desc->len = total_len;
@@ -518,7 +519,8 @@ __ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result,
                 /* pass */;
         else
                 return NULL;
-        for (i = 0; i < num_descs; i += 1 + with_ext) {
+        i = 0;
+        do {
                 struct ioat_raw_descriptor *descs[2];
                 size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log);
                 int s;
@@ -546,7 +548,7 @@ __ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result,
                 len -= xfer_size;
                 offset += xfer_size;
                 dump_desc_dbg(ioat, desc);
-        }
+        } while ((i += 1 + with_ext) < num_descs);
 
         /* last xor descriptor carries the unmap parameters and fence bit */
         desc->txd.flags = flags;
@@ -664,7 +666,8 @@ __ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result,
                 /* pass */;
         else
                 return NULL;
-        for (i = 0; i < num_descs; i += 1 + with_ext) {
+        i = 0;
+        do {
                 struct ioat_raw_descriptor *descs[2];
                 size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log);
 
@@ -703,7 +706,7 @@ __ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result,
 
                 len -= xfer_size;
                 offset += xfer_size;
-        }
+        } while ((i += 1 + with_ext) < num_descs);
 
         /* last pq descriptor carries the unmap parameters and fence bit */
         desc->txd.flags = flags;