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[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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2007-02-05 21:17:16 +01:00 committed by Martin Schwidefsky
parent 444f0e5489
commit c59d744bd8
1 changed files with 6 additions and 2 deletions
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8
drivers/s390/char/sclp.c
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@ -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);
}