diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2014-10-14 04:10:34 +0400 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2014-10-15 03:54:54 +0400 |
| commit | 016c98c6fe0c914d12e2e242b2bccde6d6dea54b (patch) | |
| tree | 6e4fb0faa50c839cc23857954bf51f9985fb93ea /drivers/virtio | |
| parent | 6fbc198cf623944ab60a1db6d306a4d55cdd820d (diff) | |
| download | linux-016c98c6fe0c914d12e2e242b2bccde6d6dea54b.tar.xz | |
virtio: unify config_changed handling
Replace duplicated code in all transports with a single wrapper in
virtio.c.
The only functional change is in virtio_mmio.c: if a buggy device sends
us an interrupt before driver is set, we previously returned IRQ_NONE,
now we return IRQ_HANDLED.
As this must not happen in practice, this does not look like a big deal.
See also commit 3fff0179e33cd7d0a688dab65700c46ad089e934
virtio-pci: do not oops on config change if driver not loaded.
for the original motivation behind the driver check.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio.c | 9 | ||||
| -rw-r--r-- | drivers/virtio/virtio_mmio.c | 7 | ||||
| -rw-r--r-- | drivers/virtio/virtio_pci.c | 6 |
3 files changed, 12 insertions, 10 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index fed0ce198ae3..3980687401f6 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -239,6 +239,15 @@ void unregister_virtio_device(struct virtio_device *dev) } EXPORT_SYMBOL_GPL(unregister_virtio_device); +void virtio_config_changed(struct virtio_device *dev) +{ + struct virtio_driver *drv = drv_to_virtio(dev->dev.driver); + + if (drv && drv->config_changed) + drv->config_changed(dev); +} +EXPORT_SYMBOL_GPL(virtio_config_changed); + static int virtio_init(void) { if (bus_register(&virtio_bus) != 0) diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index c600ccfd6922..ef9a1650bb80 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -234,8 +234,6 @@ static irqreturn_t vm_interrupt(int irq, void *opaque) { struct virtio_mmio_device *vm_dev = opaque; struct virtio_mmio_vq_info *info; - struct virtio_driver *vdrv = container_of(vm_dev->vdev.dev.driver, - struct virtio_driver, driver); unsigned long status; unsigned long flags; irqreturn_t ret = IRQ_NONE; @@ -244,9 +242,8 @@ static irqreturn_t vm_interrupt(int irq, void *opaque) status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS); writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK); - if (unlikely(status & VIRTIO_MMIO_INT_CONFIG) - && vdrv && vdrv->config_changed) { - vdrv->config_changed(&vm_dev->vdev); + if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) { + virtio_config_changed(&vm_dev->vdev); ret = IRQ_HANDLED; } diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index add40d00dcdb..f39f4e772e6a 100644 --- a/drivers/virtio/virtio_pci.c +++ b/drivers/virtio/virtio_pci.c @@ -211,12 +211,8 @@ static bool vp_notify(struct virtqueue *vq) static irqreturn_t vp_config_changed(int irq, void *opaque) { struct virtio_pci_device *vp_dev = opaque; - struct virtio_driver *drv; - drv = container_of(vp_dev->vdev.dev.driver, - struct virtio_driver, driver); - if (drv && drv->config_changed) - drv->config_changed(&vp_dev->vdev); + virtio_config_changed(&vp_dev->vdev); return IRQ_HANDLED; } |