From 902bc613cd1c49f6c5e846501f50ed0640d5408e Mon Sep 17 00:00:00 2001 From: Mao Jinlong Date: Tue, 27 Oct 2020 22:40:35 +0800 Subject: [PATCH] coresight-tmc-etr: Check if page is valid before dma_map_page Check if page is valid before dma_map_page to avoid the exception. Change-Id: Ia92c7c86c437615f2a314511049bd4ffb655a41c Signed-off-by: Mao Jinlong --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index dd00a5666f5c..8f777d4db342 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -214,6 +214,8 @@ static int tmc_pages_alloc(struct tmc_pages *tmc_pages, page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); } + if (!page) + goto err; paddr = dma_map_page(real_dev, page, 0, PAGE_SIZE, dir); if (dma_mapping_error(real_dev, paddr)) goto err;