[RFC PATCH 07/22] virtio_pci: Use request_threaded_irq() instead of request_irq()

[Kishon Vijay Abraham I]

Some of the virtio drivers (like virtio_rpmsg_bus.c) use sleeping
functions like mutex_*() in the virtqueue callback. Use
request_threaded_irq() instead of request_irq() in order for
the virtqueue callbacks to be executed in thread context instead
of interrupt context.

Signed-off-by: Kishon Vijay Abraham I <kis...@ti.com>
---
 drivers/virtio/virtio_pci_common.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c 
b/drivers/virtio/virtio_pci_common.c
index 222d630c41fc..60998b4f1f30 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -140,9 +140,9 @@ static int vp_request_msix_vectors(struct virtio_device 
*vdev, int nvectors,
        v = vp_dev->msix_used_vectors;
        snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
                 "%s-config", name);
-       err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
-                         vp_config_changed, 0, vp_dev->msix_names[v],
-                         vp_dev);
+       err = request_threaded_irq(pci_irq_vector(vp_dev->pci_dev, v), 0,
+                                  vp_config_changed, 0, vp_dev->msix_names[v],
+                                  vp_dev);
        if (err)
                goto error;
        ++vp_dev->msix_used_vectors;
@@ -159,9 +159,9 @@ static int vp_request_msix_vectors(struct virtio_device 
*vdev, int nvectors,
                v = vp_dev->msix_used_vectors;
                snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
                         "%s-virtqueues", name);
-               err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
-                                 vp_vring_interrupt, 0, vp_dev->msix_names[v],
-                                 vp_dev);
+               err = request_threaded_irq(pci_irq_vector(vp_dev->pci_dev, v),
+                                          0, vp_vring_interrupt, 0,
+                                          vp_dev->msix_names[v], vp_dev);
                if (err)
                        goto error;
                ++vp_dev->msix_used_vectors;
@@ -336,10 +336,11 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, 
unsigned nvqs,
                         sizeof *vp_dev->msix_names,
                         "%s-%s",
                         dev_name(&vp_dev->vdev.dev), names[i]);
-               err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
-                                 vring_interrupt, 0,
-                                 vp_dev->msix_names[msix_vec],
-                                 vqs[i]);
+               err = request_threaded_irq(pci_irq_vector(vp_dev->pci_dev,
+                                                         msix_vec),
+                                          0, vring_interrupt, 0,
+                                          vp_dev->msix_names[msix_vec],
+                                          vqs[i]);
                if (err)
                        goto error_find;
        }
@@ -361,8 +362,8 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, 
unsigned nvqs,
        if (!vp_dev->vqs)
                return -ENOMEM;
 
-       err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,
-                       dev_name(&vdev->dev), vp_dev);
+       err = request_threaded_irq(vp_dev->pci_dev->irq, 0, vp_interrupt,
+                                  IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
        if (err)
                goto out_del_vqs;
 
-- 
2.17.1