i40e: Fix for division by zero

For some cases when reading from device are incorrect or image is
incorrect, this part of code causes crash due to division by zero.

Change-ID: I8961029a7a87b0a479995823ef8fcbf6471405e1
Signed-off-by: Michal Kosiarz <michal.kosiarz@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index a475946..98791ba 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -3313,8 +3313,10 @@ static void i40e_parse_discover_capabilities(struct i40e_hw *hw, void *buff,
        /* partition id is 1-based, and functions are evenly spread
         * across the ports as partitions
         */
-       hw->partition_id = (hw->pf_id / hw->num_ports) + 1;
-       hw->num_partitions = num_functions / hw->num_ports;
+       if (hw->num_ports != 0) {
+               hw->partition_id = (hw->pf_id / hw->num_ports) + 1;
+               hw->num_partitions = num_functions / hw->num_ports;
+       }
 
        /* additional HW specific goodies that might
         * someday be HW version specific