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-rw-r--r--arch/parisc/kernel/irq.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index f7ae2bcd49a..21a9c5ad580 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();
}