x86/UV2: Fix BAU destination timeout initialization

Move the call to enable_timeouts() forward so that
BAU_MISC_CONTROL is initialized before using it in
calculate_destination_timeout().

Fix the calculation of a BAU destination timeout
for UV2 (in calculate_destination_timeout()).

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Link: http://lkml.kernel.org/r/20120116211848.GB5767@sgi.com
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 1341a2e..c425ff1 100644 (file)
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -1617,14 +1617,14 @@ static int calculate_destination_timeout(void)
                ts_ns = base * mult1 * mult2;
                ret = ts_ns / 1000;
        } else {
-               /* 4 bits  0/1 for 10/80us, 3 bits of multiplier */
-               mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL);
+               /* 4 bits  0/1 for 10/80us base, 3 bits of multiplier */
+               mmr_image = uv_read_local_mmr(UVH_LB_BAU_MISC_CONTROL);
                mmr_image = (mmr_image & UV_SA_MASK) >> UV_SA_SHFT;
                if (mmr_image & (1L << UV2_ACK_UNITS_SHFT))
-                       mult1 = 80;
+                       base = 80;
                else
-                       mult1 = 10;
-               base = mmr_image & UV2_ACK_MASK;
+                       base = 10;
+               mult1 = mmr_image & UV2_ACK_MASK;
                ret = mult1 * base;
        }
        return ret;
@@ -1886,6 +1886,8 @@ static int __init uv_bau_init(void)
                        uv_base_pnode = uv_blade_to_pnode(uvhub);
        }
 
+       enable_timeouts();
+
        if (init_per_cpu(nuvhubs, uv_base_pnode)) {
                nobau = 1;
                return 0;
@@ -1896,7 +1898,6 @@ static int __init uv_bau_init(void)
                if (uv_blade_nr_possible_cpus(uvhub))
                        init_uvhub(uvhub, vector, uv_base_pnode);
 
-       enable_timeouts();
        alloc_intr_gate(vector, uv_bau_message_intr1);
 
        for_each_possible_blade(uvhub) {