[PATCH 4/6] crypto: cavium - Prevent division by zero

[Manoj Iyer]

From: Jan Glauber <jglauber at cavium.com>

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

BugLink: https://launchpad.net/bugs/1787469

Signed-off-by: Jan Glauber <jglauber at cavium.com>
Reviewed-by: Robert Richter <rrichter at cavium.com>
Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
(cherry picked from commit a40c88045506ecba8e3ae75da19e8a2c53e23a41)
Signed-off-by: Manoj Iyer <manoj.iyer at canonical.com>
---
 drivers/crypto/cavium/zip/zip_main.c | 9 +++++----
 1 file 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"
-- 
2.17.1