1 files changed, 6 insertions, 7 deletions

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index f7ae2bcd49a5..21a9c5ad580b 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -250,10 +250,11 @@ void do_cpu_irq_mask(struct pt_regs *regs)
         irq_enter();
 
         /*
-         * Only allow interrupt processing to be interrupted by the
-         * timer tick
+         * Don't allow TIMER or IPI nested interrupts.
+         * Allowing any single interrupt to nest can lead to that CPU
+         * handling interrupts with all enabled interrupts unmasked.
          */
-        set_eiem(EIEM_MASK(TIMER_IRQ));
+        set_eiem(0UL);
 
         /* 1) only process IRQs that are enabled/unmasked (cpu_eiem)
          * 2) We loop here on EIRR contents in order to avoid
@@ -267,9 +268,6 @@ void do_cpu_irq_mask(struct pt_regs *regs)
                 if (!eirr_val)
                         break;
 
-                if (eirr_val & EIEM_MASK(TIMER_IRQ))
-                        set_eiem(0);
-
                 mtctl(eirr_val, 23); /* reset bits we are going to process */
 
                 /* Work our way from MSb to LSb...same order we alloc EIRs */
@@ -283,7 +281,8 @@ void do_cpu_irq_mask(struct pt_regs *regs)
                         __do_IRQ(irq, regs);
                 }
         }
-        set_eiem(cpu_eiem);
+
+        set_eiem(cpu_eiem);     /* restore original mask */
         irq_exit();
 }