crypto: cavium - Prevent division by zero

Avoid two potential divisions by zero when calculating average
values for the zip statistics.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Reviewed-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/crypto/cavium/zip/zip_main.c b/drivers/crypto/cavium/zip/zip_main.c
index 1cd8aa488185..79b449e0f955 100644
--- a/drivers/crypto/cavium/zip/zip_main.c
+++ b/drivers/crypto/cavium/zip/zip_main.c
@@ -482,10 +482,11 @@ static int zip_show_stats(struct seq_file *s, void *unused)
                                 atomic64_add(val, &st->pending_req);
                         }
 
-                        avg_chunk = (atomic64_read(&st->comp_in_bytes) /
-                                     atomic64_read(&st->comp_req_complete));
-                        avg_cr = (atomic64_read(&st->comp_in_bytes) /
-                                  atomic64_read(&st->comp_out_bytes));
+                        val = atomic64_read(&st->comp_req_complete);
+                        avg_chunk = (val) ? atomic64_read(&st->comp_in_bytes) / val : 0;
+
+                        val = atomic64_read(&st->comp_out_bytes);
+                        avg_cr = (val) ? atomic64_read(&st->comp_in_bytes) / val : 0;
                         seq_printf(s, "        ZIP Device %d Stats\n"
                                       "-----------------------------------\n"
                                       "Comp Req Submitted        : \t%lld\n"