x86/UV: Fix NULL pointer dereference in uv_flush_tlb_others() if the 'nobau' boot...

The SGI UV tlb shootdown code panics the system with a NULL
pointer deference if 'nobau' is specified on the boot
commandline.

uv_flush_tlb_other() gets called for every flush, whether the
BAU is disabled or not.  It should not be keeping the s_enters
statistic while the BAU is disabled.

The panic occurs because during initialization
init_per_cpu_tunables() does not set the bcp->statp pointer if
'nobau' was specified.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: <stable@vger.kernel.org> # 3.12.x
Link: http://lkml.kernel.org/r/E1VnzBi-0005yF-MU@eag09.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 0f92173..efe4d72 100644 (file)
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -1070,12 +1070,13 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
        unsigned long status;
 
        bcp = &per_cpu(bau_control, cpu);
-       stat = bcp->statp;
-       stat->s_enters++;
 
        if (bcp->nobau)
                return cpumask;
 
+       stat = bcp->statp;
+       stat->s_enters++;
+
        if (bcp->busy) {
                descriptor_status =
                        read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_0);