i40e: Clean up MSIX IRQs before suspend

Orabug: 24568124

The i40e_suspend() function calls another function that preps the device
for the power save and resume by freeing all the Tx/Rx resources and
interrupts but that function does not free the "other" causes interrupt
vector and IRQ. It also fails to call synchronize_irq() before freeing
the IRQ vectors.  This sometimes may result in some AER errors on those
systems with that PCIe error reporting feature enabled.

Call synchronize_irq() before freeing IRQ vectors and explicitly free
the other causes interrupt resources and shut down that MSIX interrupt.

Change-ID: Ib88e4536756518a352446da0232189716618ad81
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit b33d3b7321bb5ae291851fce31688d2d3c432e6b)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 713842696989c30e4e1715d2b18bf2cbb1a26545..5fed8f6e0195f1ebbf42531882a59ce005a56c09 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -3923,6 +3923,7 @@ static void i40e_vsi_free_irq(struct i40e_vsi *vsi)
                        /* clear the affinity_mask in the IRQ descriptor */
                        irq_set_affinity_hint(pf->msix_entries[vector].vector,
                                              NULL);
+                       synchronize_irq(pf->msix_entries[vector].vector);
                        free_irq(pf->msix_entries[vector].vector,
                                 vsi->q_vectors[i]);
 
@@ -11401,6 +11402,8 @@ static int i40e_suspend(struct pci_dev *pdev, pm_message_t state)
        wr32(hw, I40E_PFPM_APM, (pf->wol_en ? I40E_PFPM_APM_APME_MASK : 0));
        wr32(hw, I40E_PFPM_WUFC, (pf->wol_en ? I40E_PFPM_WUFC_MAG_MASK : 0));
 
+       i40e_stop_misc_vector(pf);
+
        pci_wake_from_d3(pdev, pf->wol_en);
        pci_set_power_state(pdev, PCI_D3hot);