diff options
Diffstat (limited to 'drivers/xen/grant-table.c')
| -rw-r--r-- | drivers/xen/grant-table.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 1afd5690858c..9ef54ebc1194 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -455,6 +455,8 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, unsigned long mfn; ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); + if (ret) + return ret; for (i = 0; i < count; i++) { /* m2p override only supported for GNTMAP_contains_pte mappings */ @@ -463,7 +465,9 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, pte = (pte_t *) (mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) + (map_ops[i].host_addr & ~PAGE_MASK)); mfn = pte_mfn(*pte); - m2p_add_override(mfn, pages[i]); + ret = m2p_add_override(mfn, pages[i]); + if (ret) + return ret; } return ret; @@ -476,8 +480,14 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, int i, ret; ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); - for (i = 0; i < count; i++) - m2p_remove_override(pages[i]); + if (ret) + return ret; + + for (i = 0; i < count; i++) { + ret = m2p_remove_override(pages[i]); + if (ret) + return ret; + } return ret; } |