>From 0d3781b8c0c397768c29c0351390f0fa04c9eaa8 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 12 Apr 2018 09:53:48 +0200 Subject: [PATCH v2 2/2] dma-direct: Try reallocation with GFP_DMA32 if possible This patch adds a similar fallback reallocation with GFP_DMA32 as we've done with GFP_DMA. The condition is that the coherent mask is smaller than 64bit (i.e. some address limitation), and neither GFP_DMA nor GFP_DMA32 is set beforehand. Signed-off-by: Takashi Iwai --- lib/dma-direct.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/lib/dma-direct.c b/lib/dma-direct.c index bbfb229aa067..970d39155618 100644 --- a/lib/dma-direct.c +++ b/lib/dma-direct.c @@ -84,6 +84,13 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, __free_pages(page, page_order); page = NULL; + if (IS_ENABLED(CONFIG_ZONE_DMA32) && + dev->coherent_dma_mask < DMA_BIT_MASK(64) && + !(gfp & (GFP_DMA32 | GFP_DMA))) { + gfp |= GFP_DMA32; + goto again; + } + if (IS_ENABLED(CONFIG_ZONE_DMA) && dev->coherent_dma_mask < DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) { -- 2.16.3