From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Mon, 16 Dec 2013 19:05:01 +0000 (-0500)
Subject: swiotlb: Don't DoS us with 'swiotlb buffer is full' (v2)
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;ds=sidebyside;h=0cb637bff80d5ba2b916bb19f19ffd59cd4079fd;p=deliverable%2Flinux.git

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 e4399fa65ad6..4634ac9cdb38 100644
--- 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);