1 files changed, 11 insertions, 1 deletions

diff --git a/arch/ppc/kernel/misc.S b/arch/ppc/kernel/misc.S
index 0da55368655c..a22e1f4d94c8 100644
--- a/arch/ppc/kernel/misc.S
+++ b/arch/ppc/kernel/misc.S
@@ -237,9 +237,19 @@ _GLOBAL(_tlbie)
         mfspr   r4,SPRN_MMUCR
         mfspr   r5,SPRN_PID                     /* Get PID */
         rlwimi  r4,r5,0,24,31                   /* Set TID */
-        mtspr   SPRN_MMUCR,r4
 
+        /* We have to run the search with interrupts disabled, even critical
+         * and debug interrupts (in fact the only critical exceptions we have
+         * are debug and machine check).  Otherwise  an interrupt which causes
+         * a TLB miss can clobber the MMUCR between the mtspr and the tlbsx. */
+        mfmsr   r5
+        lis     r6,(MSR_EE|MSR_CE|MSR_ME|MSR_DE)@ha
+        addi    r6,r6,(MSR_EE|MSR_CE|MSR_ME|MSR_DE)@l
+        andc    r6,r5,r6
+        mtmsr   r6
+        mtspr   SPRN_MMUCR,r4
         tlbsx.  r3, 0, r3
+        mtmsr   r5
         bne     10f
         sync
         /* There are only 64 TLB entries, so r3 < 64,