ice: Stop processing VF messages during teardown

When VFs are setup and torn down in quick succession, it is possible
that a VF is torn down by the PF while the VF's virtchnl requests are
still in the PF's mailbox ring. Processing the VF's virtchnl request
when the VF itself doesn't exist results in undefined behavior. Fix
this by adding a check to stop processing virtchnl requests when VF
teardown is in progress.

Fixes: ddf30f7ff840 ("ice: Add handler to configure SR-IOV")
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index a450343..eadcb99 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -234,6 +234,7 @@ enum ice_pf_state {
        ICE_VFLR_EVENT_PENDING,
        ICE_FLTR_OVERFLOW_PROMISC,
        ICE_VF_DIS,
+       ICE_VF_DEINIT_IN_PROGRESS,
        ICE_CFG_BUSY,
        ICE_SERVICE_SCHED,
        ICE_SERVICE_DIS,

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
index 2826570..e93430a 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
@@ -615,6 +615,8 @@ void ice_free_vfs(struct ice_pf *pf)
        struct ice_hw *hw = &pf->hw;
        unsigned int tmp, i;
 
+       set_bit(ICE_VF_DEINIT_IN_PROGRESS, pf->state);
+
        if (!pf->vf)
                return;
 
@@ -680,6 +682,7 @@ void ice_free_vfs(struct ice_pf *pf)
                                i);
 
        clear_bit(ICE_VF_DIS, pf->state);
+       clear_bit(ICE_VF_DEINIT_IN_PROGRESS, pf->state);
        clear_bit(ICE_FLAG_SRIOV_ENA, pf->flags);
 }
 
@@ -4415,6 +4418,10 @@ void ice_vc_process_vf_msg(struct ice_pf *pf, struct ice_rq_event_info *event)
        struct device *dev;
        int err = 0;
 
+       /* if de-init is underway, don't process messages from VF */
+       if (test_bit(ICE_VF_DEINIT_IN_PROGRESS, pf->state))
+               return;
+
        dev = ice_pf_to_dev(pf);
        if (ice_validate_vf_id(pf, vf_id)) {
                err = -EINVAL;