[SRU][Artful][PATCH 1/1] PCI: vmd: Free up IRQs on suspend path

[Joseph Salisbury]

From: Scott Bauer <scott.bauer at intel.com>

BugLink: http://bugs.launchpad.net/bugs/1745508

Free up the IRQs we request on the suspend path and reallocate them on the
resume path.

Fixes this error:

  CPU 111 disable failed: CPU has 9 vectors assigned and there are only 0 available.
  Error taking CPU111 down: -34
  Non-boot CPUs are not disabled
  Enabling non-boot CPUs ...

Signed-off-by: Scott Bauer <scott.bauer at intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
Acked-by: Keith Busch <keith.busch at intel.com>
(cherry picked from commit e2b1820bd5d0962d6f271b0d47c3a0e38647df2f)
Signed-off-by: Joseph Salisbury <joseph.salisbury at canonical.com>
---
 drivers/pci/host/vmd.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
index 6088c30..cfc880b 100644
--- a/drivers/pci/host/vmd.c
+++ b/drivers/pci/host/vmd.c
@@ -755,6 +755,11 @@ static void vmd_remove(struct pci_dev *dev)
 static int vmd_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct vmd_dev *vmd = pci_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < vmd->msix_count; i++)
+                devm_free_irq(dev, pci_irq_vector(pdev, i), &vmd->irqs[i]);
 
 	pci_save_state(pdev);
 	return 0;
@@ -763,6 +768,16 @@ static int vmd_suspend(struct device *dev)
 static int vmd_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct vmd_dev *vmd = pci_get_drvdata(pdev);
+	int err, i;
+
+	for (i = 0; i < vmd->msix_count; i++) {
+		err = devm_request_irq(dev, pci_irq_vector(pdev, i),
+				       vmd_irq, IRQF_NO_THREAD,
+				       "vmd", &vmd->irqs[i]);
+		if (err)
+			return err;
+	}
 
 	pci_restore_state(pdev);
 	return 0;
-- 
2.7.4