[SPARC64]: Temporarily remove IOMMU merging code.

Changeset fde6a3c82d67f592eb587be4d12222b0ae6d4321 ("iommu sg merging:
sparc64: make iommu respect the segment size limits") broke sparc64
because whilst it added the segment limiting code to the first pass of
SG mapping (in prepare_sg()) it did not add matching code to the
second pass handling (in fill_sg())

As a result the two passes disagree where the segment boundaries
should be, resulting in OOPSes, DMA corruption, and corrupted
superblocks.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/asm-sparc64/io.h b/include/asm-sparc64/io.h
index c299b853b5ba..b6ece223562d 100644
--- a/include/asm-sparc64/io.h
+++ b/include/asm-sparc64/io.h
@@ -16,7 +16,7 @@
 /* BIO layer definitions. */
 extern unsigned long kern_base, kern_size;
 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
-#define BIO_VMERGE_BOUNDARY     8192
+#define BIO_VMERGE_BOUNDARY     0
 
 static inline u8 _inb(unsigned long addr)
 {