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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2011-02-25 14:44:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-25 15:07:36 -0800
commitfba99fa38b023224680308a482e12a0eca87e4e1 (patch)
treec4dba5806fbe88b626805293cf14e6c2b08ca870
parentf8407f26b4c9a36aab74fcdbd6e14ffe4f8d9476 (diff)
downloadlinux-fba99fa38b023224680308a482e12a0eca87e4e1.tar.gz
swiotlb: fix wrong panic
swiotlb's map_page wrongly calls panic() when it can't find a buffer fit for device's dma mask. It should return an error instead. Devices with an odd dma mask (i.e. under 4G) like b44 network card hit this bug (the system crashes): http://marc.info/?l=linux-kernel&m=129648943830106&w=2 If swiotlb returns an error, b44 driver can use the own bouncing mechanism. Reported-by: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Tested-by: Arkadiusz Miskiewicz <arekm@maven.pl> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--lib/swiotlb.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c47bbe11b80..93ca08b8a45 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -686,8 +686,10 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
/*
* Ensure that the address returned is DMA'ble
*/
- if (!dma_capable(dev, dev_addr, size))
- panic("map_single: bounce buffer is not DMA'ble");
+ if (!dma_capable(dev, dev_addr, size)) {
+ swiotlb_tbl_unmap_single(dev, map, size, dir);
+ dev_addr = swiotlb_virt_to_bus(dev, io_tlb_overflow_buffer);
+ }
return dev_addr;
}