linux-kernel - [PATCH 4.9 135/137] PCI: vmd: Free up IRQs on suspend path

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Date:   Mon, 11 Feb 2019 15:20:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Scott Bauer <scott.bauer@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Keith Busch <keith.busch@...el.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Sushma Kalakota <sushmax.kalakota@...el.com>
Subject: [PATCH 4.9 135/137] PCI: vmd: Free up IRQs on suspend path

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Scott Bauer <scott.bauer@...el.com>

commit e2b1820bd5d0962d6f271b0d47c3a0e38647df2f upstream.

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@...el.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Keith Busch <keith.busch@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Jon Derrick <jonathan.derrick@...el.com>
Signed-off-by: Sushma Kalakota <sushmax.kalakota@...el.com>

---
 drivers/pci/host/vmd.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/drivers/pci/host/vmd.c
+++ b/drivers/pci/host/vmd.c
@@ -731,6 +731,11 @@ static void vmd_remove(struct pci_dev *d
 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;
@@ -739,6 +744,16 @@ static int vmd_suspend(struct device *de
 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;