swiotlb: Don't DoS us with 'swiotlb buffer is full' (v2)

There is no need for that so lets use ratelimiting.
Also add some extra information to be helpful.

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
[v2: s/ld/zs on the printk]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index e4399fa65ad6b921aa88ed2a881d27118dda2dbb..4634ac9cdb38e8fd31ed06f073078f8e7010c6e4 100644 (file)
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -505,7 +505,8 @@ 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");
+       if (printk_ratelimit())
+               dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
        return SWIOTLB_MAP_ERROR;
 found:
        spin_unlock_irqrestore(&io_tlb_lock, flags);