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ixgbe: fix possible divide by zero in ixgbe_update_itr

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Protect the code by bailing out of ixgbe_update_itr() when this occurs.
The next call to ixgbe_update_itr will continue to dynamically update ITR.

Signed-of-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Don Skidmore 2013-03-02 07:17:37 +00:00 committed by Jeff Kirsher
parent 01f27fc085
commit bdbeefe8ea
1 changed files with 3 additions and 0 deletions
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drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -2095,6 +2095,9 @@ static void ixgbe_update_itr(struct ixgbe_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) {