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virtio-pci queue allocation not page-aligned

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kzalloc() does not guarantee page alignment, and in fact this broke when
I enabled CONFIG_SLUB_DEBUG_ON.

(Thanks to Anthony Liguori for spotting the missing kfree sub)

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (fixed kfree)
Tested-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Hollis Blanchard 2008-12-02 16:24:40 -06:00 committed by Rusty Russell
parent 3c92ec8ae9
commit 13b1eb333b
1 changed files with 7 additions and 5 deletions
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12
drivers/virtio/virtio_pci.c
View file

@ -216,7 +216,7 @@ static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index,
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info;
struct virtqueue *vq;
unsigned long flags;
unsigned long flags, size;
u16 num;
int err;
@ -237,7 +237,8 @@ static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index,
info->queue_index = index;
info->num = num;
info->queue = kzalloc(PAGE_ALIGN(vring_size(num,PAGE_SIZE)), GFP_KERNEL);
size = PAGE_ALIGN(vring_size(num, PAGE_SIZE));
info->queue = alloc_pages_exact(size, GFP_KERNEL|__GFP_ZERO);
if (info->queue == NULL) {
err = -ENOMEM;
goto out_info;
@ -266,7 +267,7 @@ static struct virtqueue *vp_find_vq(struct virtio_device *vdev, unsigned index,
out_activate_queue:
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
kfree(info->queue);
free_pages_exact(info->queue, size);
out_info:
kfree(info);
return ERR_PTR(err);
@ -277,7 +278,7 @@ static void vp_del_vq(struct virtqueue *vq)
{
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_vq_info *info = vq->priv;
unsigned long flags;
unsigned long flags, size;
spin_lock_irqsave(&vp_dev->lock, flags);
list_del(&info->node);
@ -289,7 +290,8 @@ static void vp_del_vq(struct virtqueue *vq)
iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
iowrite32(0, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
kfree(info->queue);
size = PAGE_ALIGN(vring_size(info->num, PAGE_SIZE));
free_pages_exact(info->queue, size);
kfree(info);
}