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ice: fix the divide by zero issue

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Static analysis flagged a potential divide by zero error because
vsi->num_rxq can become zero in certain condition and it is used as
divisor.

Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Kiran Patil 2019-02-26 16:35:10 -08:00 committed by Jeff Kirsher
parent 5743020d37
commit 60dcc39ea3
1 changed files with 12 additions and 1 deletions
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13
drivers/net/ethernet/intel/ice/ice_lib.c
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@ -881,7 +881,18 @@ static void ice_vsi_setup_q_map(struct ice_vsi *vsi, struct ice_vsi_ctx *ctxt)
tx_count += tx_numq_tc;
ctxt->info.tc_mapping[i] = cpu_to_le16(qmap);
}
vsi->num_rxq = offset;
/* if offset is non-zero, means it is calculated correctly based on
* enabled TCs for a given VSI otherwise qcount_rx will always
* be correct and non-zero because it is based off - VSI's
* allocated Rx queues which is at least 1 (hence qcount_tx will be
* at least 1)
*/
if (offset)
vsi->num_rxq = offset;
else
vsi->num_rxq = qcount_rx;
vsi->num_txq = tx_count;
if (vsi->type == ICE_VSI_VF && vsi->num_txq != vsi->num_rxq) {