From c59d744bd8a0e283daf6726881e4c9aa4bd25261 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 5 Feb 2007 21:17:16 +0100 Subject: [PATCH] [S390] sclp: don't call local_bh_disable/_local_bh_enable if in_interrupt() local_bh_disable/_local_bh_enable must not be called if in_irq() is true. Besides that if in_interrupt() is true bottom halves are disabled anyway. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/char/sclp.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index 3457a9a3157..027cdc18df3 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -402,6 +402,7 @@ sclp_sync_wait(void) unsigned long flags; unsigned long cr0, cr0_sync; u64 timeout; + int irq_context; /* We'll be disabling timer interrupts, so we need a custom timeout * mechanism */ @@ -414,7 +415,9 @@ sclp_sync_wait(void) } local_irq_save(flags); /* Prevent bottom half from executing once we force interrupts open */ - local_bh_disable(); + irq_context = in_interrupt(); + if (!irq_context) + local_bh_disable(); /* Enable service-signal interruption, disable timer interrupts */ trace_hardirqs_on(); __ctl_store(cr0, 0, 0); @@ -435,7 +438,8 @@ sclp_sync_wait(void) } local_irq_disable(); __ctl_load(cr0, 0, 0); - _local_bh_enable(); + if (!irq_context) + _local_bh_enable(); local_irq_restore(flags); } -- 2.41.1