xen-netback: Move grant_copy_op array back into struct xenvif.

This array was allocated separately in commit ac3d5ac2 ("xen-netback:
fix guest-receive-side array sizes") due to it being very large, and a
struct xenvif is allocated as the netdev_priv part of a struct
net_device, i.e. via kmalloc() but falling back to vmalloc() if the
initial alloc. fails.

In preparation for the multi-queue patches, where this array becomes
part of struct xenvif_queue and is always allocated through vzalloc(),
move this back into the struct xenvif.

Signed-off-by: Andrew J. Bennieston <andrew.bennieston@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 1 insertions, 11 deletions

diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 0d4a285cbd7e..2c283d693330 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -158,8 +158,7 @@ struct xenvif {
 
         struct timer_list wake_queue;
 
-        /* This array is allocated seperately as it is large */
-        struct gnttab_copy *grant_copy_op;
+        struct gnttab_copy grant_copy_op[MAX_GRANT_COPY_OPS];
 
         /* We create one meta structure per ring request we consume, so
          * the maximum number is the same as the ring size.
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 53cdcdf3dfa1..8fdedac3fab2 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -334,14 +334,6 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
 
         vif = netdev_priv(dev);
 
-        vif->grant_copy_op = vmalloc(sizeof(struct gnttab_copy) *
-                                     MAX_GRANT_COPY_OPS);
-        if (vif->grant_copy_op == NULL) {
-                pr_warn("Could not allocate grant copy space for %s\n", name);
-                free_netdev(dev);
-                return ERR_PTR(-ENOMEM);
-        }
-
         vif->domid  = domid;
         vif->handle = handle;
         vif->can_sg = 1;
@@ -601,7 +593,6 @@ void xenvif_free(struct xenvif *vif)
 
         unregister_netdev(vif->dev);
 
-        vfree(vif->grant_copy_op);
         free_netdev(vif->dev);
 
         module_put(THIS_MODULE);