[net-next 02/10] ixgbevf: fix possible divide by zero in ixgbevf_update_itr

[Jeff Kirsher]

From: Young Xiao <92siuy...@gmail.com>

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 <92siuy...@gmail.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.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 d189ed247665..d2b41f9f87f8 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) {
-- 
2.21.0