powerpc/powernv/idle: Fix restore of SPRN_LDBAR for POWER9 stop state.

commit 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in C")
reimplemented book3S code to pltform/powernv/idle.c. But when doing so
missed to add the per-thread LDBAR update in the core_woken path of
the power9_idle_stop(). Patch fixes the same.

Fixes: 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in C")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190702105836.26695-1-maddy@linux.vnet.ibm.com

diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
index f9ab8951076621de957351a04aeca2392e115752..210fb73a5121f4314f1adf91521a1bb8fd905b30 100644 (file)
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -762,7 +762,6 @@ static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
        mtspr(SPRN_PTCR,        sprs.ptcr);
        mtspr(SPRN_RPR,         sprs.rpr);
        mtspr(SPRN_TSCR,        sprs.tscr);
-       mtspr(SPRN_LDBAR,       sprs.ldbar);
 
        if (pls >= pnv_first_tb_loss_level) {
                /* TB loss */
@@ -794,6 +793,7 @@ core_woken:
        mtspr(SPRN_MMCR0,       sprs.mmcr0);
        mtspr(SPRN_MMCR1,       sprs.mmcr1);
        mtspr(SPRN_MMCR2,       sprs.mmcr2);
+       mtspr(SPRN_LDBAR,       sprs.ldbar);
 
        mtspr(SPRN_SPRG3,       local_paca->sprg_vdso);