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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-07-22 12:51:48 -0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-08-26 12:10:16 -0400
commitab2a47bd242d6cdcf6b2b64797f271c6f0a6d338 (patch)
tree6114a67bccfe4e81698be4c26daa5089010c30a7 /drivers/xen
parentf4b2f07b2ed9b469ead87e06fc2fc3d12663a725 (diff)
downloadop-kernel-dev-ab2a47bd242d6cdcf6b2b64797f271c6f0a6d338.zip
op-kernel-dev-ab2a47bd242d6cdcf6b2b64797f271c6f0a6d338.tar.gz
xen-swiotlb: Fix wrong panic.
Propagate the baremetal git commit "swiotlb: fix wrong panic" (fba99fa38b023224680308a482e12a0eca87e4e1) in the Xen-SWIOTLB version. wherein 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 xen-swiotlb returns an error, b44 driver can use the own bouncing mechanism. CC: stable@kernel.org Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/swiotlb-xen.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index d45cbac..ea8c289 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -293,9 +293,10 @@ dma_addr_t xen_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 = 0;
+ }
return dev_addr;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_map_page);
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