From mboxrd@z Thu Jan 1 00:00:00 1970 From: shashim@codeaurora.org (Shiraz Hashim) Date: Thu, 22 Mar 2018 17:44:18 +0530 Subject: [PATCH 1/1] arm: dma-mapping: DMA buf may not have cpu virtual addr Message-ID: <1521720858-9031-1-git-send-email-shashim@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org DMA buffers may not have cpu virtual addresses when allocated using DMA_ATTR_NO_KERNEL_MAPPING attribute. Page address should therefore be looked up while searching for such dma bufs. Signed-off-by: Shiraz Hashim --- arch/arm/mm/dma-mapping.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index ada8eb2..c85fc0a 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -883,9 +883,10 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr, .page = page, .want_vaddr = ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) == 0), }; + void *addr = (args.want_vaddr) ? cpu_addr : page; - buf = arm_dma_buffer_find(cpu_addr); - if (WARN(!buf, "Freeing invalid buffer %p\n", cpu_addr)) + buf = arm_dma_buffer_find(addr); + if (WARN(!buf, "Freeing invalid buffer %p\n", addr)) return; buf->allocator->free(&args); -- Shiraz Hashim QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation