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| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-12-02 23:24:40 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-12-29 23:55:56 +0100 |
| commit | 13b1eb333beed018140be3d0b77bf34000125a34 (patch) | |
| tree | 26d84c1c955ad87687266433e8e54fa6f88bd150 /drivers/virtio | |
| parent | Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/p... (diff) | |
| download | linux-13b1eb333beed018140be3d0b77bf34000125a34.tar.xz linux-13b1eb333beed018140be3d0b77bf34000125a34.zip | |
virtio-pci queue allocation not page-aligned
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>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index c7dc37c7cce9..7c385af071a6 100644 --- a/drivers/virtio/virtio_pci.c +++ b/drivers/virtio/virtio_pci.c @@ -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); } |