x86: use WARN_ON in mapping functions
In the very same way i386 do, we use WARN_ON functions
in map_simple and map_sg.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/pci-nommu_64.c b/arch/x86/kernel/pci-nommu_64.c
index c6901e7..8d036ae 100644
--- a/arch/x86/kernel/pci-nommu_64.c
+++ b/arch/x86/kernel/pci-nommu_64.c
@@ -30,6 +30,7 @@
int direction)
{
dma_addr_t bus = paddr;
+ WARN_ON(size == 0);
if (!check_addr("map_single", hwdev, bus, size))
return bad_dma_address;
flush_write_buffers();
@@ -58,6 +59,8 @@
struct scatterlist *s;
int i;
+ WARN_ON(nents == 0 || sg[0].length == 0);
+
for_each_sg(sg, s, nents, i) {
BUG_ON(!sg_page(s));
s->dma_address = sg_phys(s);
