net/ibmvnic: Fix EOI when running in XIVE mode.

[ Upstream commit 11d49ce9 ]

pSeries machines on POWER9 processors can run with the XICS (legacy)
interrupt mode or with the XIVE exploitation interrupt mode. These
interrupt contollers have different interfaces for interrupt
management : XICS uses hcalls and XIVE loads and stores on a page.
H_EOI being a XICS interface the enable_scrq_irq() routine can fail
when the machine runs in XIVE mode.

Fix that by calling the EOI handler of the interrupt chip.

Fixes: f23e0643 ("ibmvnic: Clear pending interrupt after device reset")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/ibm/ibmvnic.c

@@ -2731,12 +2731,10 @@ static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
 
 	if (adapter->resetting &&
 	    adapter->reset_reason == VNIC_RESET_MOBILITY) {
-		u64 val = (0xff000000) | scrq->hw_irq;
+		struct irq_desc *desc = irq_to_desc(scrq->irq);
+		struct irq_chip *chip = irq_desc_get_chip(desc);
 
-		rc = plpar_hcall_norets(H_EOI, val);
-		if (rc)
-			dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n",
-				val, rc);
+		chip->irq_eoi(&desc->irq_data);
 	}
 
 	rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,