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s390/time: return with irqs disabled from psw_idle

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Modify the psw_idle waiting logic in entry[64].S to return with
interrupts disabled. This avoids potential issues with udelay
and interrupt loops as interrupts are not reenabled after
clock comparator interrupts.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2013-08-23 14:45:58 +02:00
parent 6b169ac9b4
commit 0587d409ec
5 changed files with 4 additions and 6 deletions
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2
arch/s390/lib/delay.c
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@@ -44,7 +44,6 @@ static void __udelay_disabled(unsigned long long usecs)
do {
set_clock_comparator(end);
vtime_stop_cpu();
local_irq_disable();
} while (get_tod_clock() < end);
lockdep_on();
__ctl_load(cr0, 0, 0);
@@ -64,7 +63,6 @@ static void __udelay_enabled(unsigned long long usecs)
set_clock_comparator(end);
}
vtime_stop_cpu();
local_irq_disable();
if (clock_saved)
local_tick_enable(clock_saved);
} while (get_tod_clock() < end);