From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chen Gang Subject: [PATCH] arch: metag: kernel: dma.c: check 'pud' whether is NULL in dma_alloc_init() Date: Thu, 14 Nov 2013 16:11:21 +0800 Message-ID: <528485A9.5050509@asianux.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-metag-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: James Hogan , qiuxishi-hv44wF8Li93QT0dZR+AlfA@public.gmane.org Cc: Andrew Morton , linux-metag-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Like another p?d_alloc(), pud_alloc() also may fail, so need check it. Signed-off-by: Chen Gang --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-metag" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html