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coresight-tmc-etr: Check if page is valid before dma_map_page

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Check if page is valid before dma_map_page to avoid the exception.

Change-Id: Ia92c7c86c437615f2a314511049bd4ffb655a41c
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>
This commit is contained in:
Mao Jinlong 2020-10-27 22:40:35 +08:00
commit 902bc613cd
1 changed files with 2 additions and 0 deletions
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2
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@ -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;