From bf6f6aa46feada857a52cb67d99a7c2fe4a70e87 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Wed, 21 Feb 2007 10:55:00 +0100 Subject: [S390] prevent softirqs if delay is called disabled The new delay implementation uses the clock comparator and an external interrupt even if it is called disabled for interrupts. To do this all external interrupt source except clock comparator are switched of before enabling external interrupts. The external interrupt at the end of the delay period may not execute softirqs or we can end up in a dead-lock. Signed-off-by: Martin Schwidefsky --- arch/s390/lib/delay.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch') diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index 02854449b74..70f2a862b67 100644 --- a/arch/s390/lib/delay.c +++ b/arch/s390/lib/delay.c @@ -15,6 +15,7 @@ #include #include #include +#include void __delay(unsigned long loops) { @@ -35,7 +36,11 @@ void __udelay(unsigned long usecs) { u64 end, time, jiffy_timer = 0; unsigned long flags, cr0, mask, dummy; + int irq_context; + irq_context = in_interrupt(); + if (!irq_context) + local_bh_disable(); local_irq_save(flags); if (raw_irqs_disabled_flags(flags)) { jiffy_timer = S390_lowcore.jiffy_timer; @@ -62,6 +67,8 @@ void __udelay(unsigned long usecs) __ctl_load(cr0, 0, 0); S390_lowcore.jiffy_timer = jiffy_timer; } + if (!irq_context) + _local_bh_enable(); set_clock_comparator(S390_lowcore.jiffy_timer); local_irq_restore(flags); } -- cgit v1.2.3