swiotlb: print a warning when the swiotlb is full

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Changes in v7:
- use dev_warn instead of pr_warn.

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 4221cb52387d..4d50058d9630 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -542,6 +542,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
                                                                  sg->length,
                                                                  dir);
                         if (map == SWIOTLB_MAP_ERROR) {
+                                dev_warn(hwdev, "swiotlb buffer is full\n");
                                 /* Don't panic here, we expect map_sg users
                                    to do proper error handling. */
                                 xen_swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,