linux-kernel - [PATCH] ixgbevf: fix possible divide by zero in ixgbevf_update

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Message-Id: <1559044682-23446-1-git-send-email-92siuyang@gmail.com>
Date:   Tue, 28 May 2019 19:58:02 +0800
From:   Young Xiao <92siuyang@...il.com>
To:     jeffrey.t.kirsher@...el.com, davem@...emloft.net,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Young Xiao <92siuyang@...il.com>
Subject: [PATCH] ixgbevf: fix possible divide by zero in ixgbevf_update_itr

The next call to ixgbevf_update_itr will continue to dynamically
update ITR.

Copy from commit bdbeefe8ea8c ("ixgbe: fix possible divide by zero in
ixgbe_update_itr")

Signed-off-by: Young Xiao <92siuyang@...il.com>
---
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index d189ed2..d2b41f9 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -1423,6 +1423,9 @@ static void ixgbevf_update_itr(struct ixgbevf_q_vector *q_vector,
 	 */
 	/* what was last interrupt timeslice? */
 	timepassed_us = q_vector->itr >> 2;
+	if (timepassed_us == 0)
+		return;
+
 	bytes_perint = bytes / timepassed_us; /* bytes/usec */
 
 	switch (itr_setting) {
-- 
2.7.4