linux-kernel - [PATCH v2 3/5] crypto: thunderx

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Message-Id: <20180409154554.7578-4-jglauber@cavium.com>
Date:   Mon,  9 Apr 2018 17:45:52 +0200
From:   Jan Glauber <jglauber@...ium.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "David S . Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mahipal Challa <Mahipal.Challa@...ium.com>,
        Robert Richter <rrichter@...ium.com>,
        Jan Glauber <jglauber@...ium.com>
Subject: [PATCH v2 3/5] crypto: thunderx_zip: Prevent division by zero

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

Signed-off-by: Jan Glauber <jglauber@...ium.com>
Reviewed-by: Robert Richter <rrichter@...ium.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"
-- 
2.16.2