From 13b1eb333beed018140be3d0b77bf34000125a34 Mon Sep 17 00:00:00 2001 From: Hollis Blanchard Date: Tue, 2 Dec 2008 16:24:40 -0600 Subject: 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 Signed-off-by: Rusty Russell (fixed kfree) Tested-by: Anthony Liguori --- drivers/virtio/virtio_pci.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'drivers/virtio/virtio_pci.c') 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); } -- cgit v1.2.3-59-g8ed1b