From a2b89b596c5a0b288adac84b17bdda6bde8d144e Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Thu, 23 Oct 2008 18:42:03 +0900 Subject: [PATCH] swiotlb: remove panic for alloc_coherent failure swiotlb_alloc_coherent calls panic() when allocated swiotlb pages is not fit for a device's dma mask. However, alloc_coherent failure is not a disaster at all. AFAIK, none of other x86 and IA64 IOMMU implementations don't crash in case of alloc_coherent failure. There are some drivers that don't check alloc_coherent failure but not many (about ten and I've already started to fix some of them). alloc_coherent returns NULL in case of failure so it's likely that these guilty drivers crash immediately. So swiotlb doesn't need to call panic() just for them. Reported-by: Takashi Iwai Signed-off-by: FUJITA Tomonori Tested-by: Takashi Iwai Signed-off-by: Ingo Molnar --- lib/swiotlb.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/swiotlb.c b/lib/swiotlb.c index f8eebd489149..78330c37a61b 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -497,8 +497,10 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size, printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", (unsigned long long)*hwdev->dma_mask, (unsigned long long)dev_addr); - panic("swiotlb_alloc_coherent: allocated memory is out of " - "range for device"); + + /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ + unmap_single(hwdev, ret, size, DMA_TO_DEVICE); + return NULL; } *dma_handle = dev_addr; return ret; -- 2.20.1