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/lib/swiotlb.c b/lib/swiotlb.c
index 4e8686c7e5a4..cdc051eaf667 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -502,6 +502,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
 
 not_found:
 	spin_unlock_irqrestore(&io_tlb_lock, flags);
+	dev_warn(hwdev, "swiotlb buffer is full\n");
 	return SWIOTLB_MAP_ERROR;
 found:
 	spin_unlock_irqrestore(&io_tlb_lock, flags);