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SubjectRe: [PATCH net-next v4 1/9] xen-netback: Introduce TX grant map definitions
On 14/01/14 20:39, Zoltan Kiss wrote:
> @@ -1677,6 +1793,31 @@ static void xenvif_idx_release(struct xenvif *vif, u16 pending_idx,
> vif->mmap_pages[pending_idx] = NULL;
> }
>
> +void xenvif_idx_unmap(struct xenvif *vif, u16 pending_idx)
> +{
> + int ret;
> + struct gnttab_unmap_grant_ref tx_unmap_op;
> +
> + if (vif->grant_tx_handle[pending_idx] == NETBACK_INVALID_HANDLE) {
> + netdev_err(vif->dev,
> + "Trying to unmap invalid handle! pending_idx: %x\n",
> + pending_idx);
> + return;
> + }
> + gnttab_set_unmap_op(&tx_unmap_op,
> + idx_to_kaddr(vif, pending_idx),
> + GNTMAP_host_map,
> + vif->grant_tx_handle[pending_idx]);
> + ret = gnttab_unmap_refs(&tx_unmap_op,
> + &vif->mmap_pages[pending_idx],
> + 1);
> +
> + ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
> + &tx_unmap_op,
> + 1);
> + BUG_ON(ret);
> + vif->grant_tx_handle[pending_idx] = NETBACK_INVALID_HANDLE;
> +}

Awkward mistake, I forgot to delete the hypercall ... Even more
interesting, it caused troubles only very rarely ...

Zoli


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