From fb71285f0c1633a85544784aae7577502274b77a Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Wed, 22 Aug 2012 14:50:42 +0200 Subject: [PATCH] ARM: DMA-Mapping: print warning when atomic coherent allocation fails Print a loud warning when system runs out of memory from atomic DMA coherent pool to let users notice the potential problem. Reported-by: Aaro Koskinen Signed-off-by: Marek Szyprowski --- arch/arm/mm/dma-mapping.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index d1cc9c1d3566..acced9332109 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -461,6 +461,10 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page) bitmap_set(pool->bitmap, pageno, count); ptr = pool->vaddr + PAGE_SIZE * pageno; *ret_page = pool->page + pageno; + } else { + pr_err_once("ERROR: %u KiB atomic DMA coherent pool is too small!\n" + "Please increase it with coherent_pool= kernel parameter!\n", + (unsigned)pool->size / 1024); } spin_unlock_irqrestore(&pool->lock, flags); -- GitLab