parisc: Fix race in pci-dma.c

We are still troubled by occasional random segmentation faults and
memory memory corruption on SMP machines.  The causes quite a few
package builds to fail on the Debian buildd machines for parisc.  When
gcc-6 failed to build three times in a row, I looked again at the TLB
related code.  I found a couple of issues.  This is the first.

In general, we need to ensure page table updates and corresponding TLB
purges are atomic.  The attached patch fixes an instance in pci-dma.c
where the page table update was not guarded by the TLB lock.

Tested on rp3440 and c8000.  So far, no further random segmentation
faults have been observed.

Signed-off-by: John David Anglin  <dave.anglin@bell.net>
Cc: <stable@vger.kernel.org> # v3.16+
Signed-off-by: Helge Deller <deller@gmx.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index 02d9ed0f3949..494ff6e8c88a 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c
@@ -95,8 +95,8 @@ static inline int map_pte_uncached(pte_t * pte,
 
                 if (!pte_none(*pte))
                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
-                set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
                 purge_tlb_start(flags);
+                set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
                 pdtlb_kernel(orig_vaddr);
                 purge_tlb_end(flags);
                 vaddr += PAGE_SIZE;