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-rw-r--r--arch/powerpc/kernel/interrupt_64.S13
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S
index 978a173eb339..a019ed6fc839 100644
--- a/arch/powerpc/kernel/interrupt_64.S
+++ b/arch/powerpc/kernel/interrupt_64.S
@@ -532,15 +532,24 @@ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel)
* Returning to soft-disabled context.
* Check if a MUST_HARD_MASK interrupt has become pending, in which
* case we need to disable MSR[EE] in the return context.
+ *
+ * The MSR[EE] check catches among other things the short incoherency
+ * in hard_irq_disable() between clearing MSR[EE] and setting
+ * PACA_IRQ_HARD_DIS.
*/
ld r12,_MSR(r1)
andi. r10,r12,MSR_EE
beq .Lfast_kernel_interrupt_return_\srr\() // EE already disabled
lbz r11,PACAIRQHAPPENED(r13)
andi. r10,r11,PACA_IRQ_MUST_HARD_MASK
- beq .Lfast_kernel_interrupt_return_\srr\() // No HARD_MASK pending
+ bne 1f // HARD_MASK is pending
+ // No HARD_MASK pending, clear possible HARD_DIS set by interrupt
+ andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
+ stb r11,PACAIRQHAPPENED(r13)
+ b .Lfast_kernel_interrupt_return_\srr\()
+
- /* Must clear MSR_EE from _MSR */
+1: /* Must clear MSR_EE from _MSR */
#ifdef CONFIG_PPC_BOOK3S
li r10,0
/* Clear valid before changing _MSR */