[PATCH] arch: metag: kernel: dma.c: check 'pud' whether is NULL in dma_alloc_init()

[Chen Gang]

Like another p?d_alloc(), pud_alloc() also may fail, so need check it.

Signed-off-by: Chen Gang <gang.c...@asianux.com>
---
 arch/metag/kernel/dma.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c
index db589ad..e6cf39b 100644
--- a/arch/metag/kernel/dma.c
+++ b/arch/metag/kernel/dma.c
@@ -398,6 +398,11 @@ static int __init dma_alloc_init(void)
                int offset = pgd_index(CONSISTENT_START);
                pgd = pgd_offset(&init_mm, CONSISTENT_START);
                pud = pud_alloc(&init_mm, pgd, CONSISTENT_START);
+               if (!pud) {
+                       pr_err("%s: no pud tables\n", __func__);
+                       ret = -ENOMEM;
+                       break;
+               }
                pmd = pmd_alloc(&init_mm, pud, CONSISTENT_START);
                if (!pmd) {
                        pr_err("%s: no pmd tables\n", __func__);
-- 
1.7.7.6
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