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 <jinlmao@codeaurora.org>

parent 12007b0e

drivers/hwtracing/coresight/coresight-tmc-etr.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;