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powerpc: Fix missing/delayed calls to irq_work

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commit 230b303479 upstream.

When replaying interrupts (as a result of the interrupt occurring
while soft-disabled), in the case of the decrementer, we are exclusively
testing for a pending timer target. However we also use decrementer
interrupts to trigger the new "irq_work", which in this case would
be missed.

This change the logic to force a replay in both cases of a timer
boundary reached and a decrementer interrupt having actually occurred
while disabled. The former test is still useful to catch cases where
a CPU having been hard-disabled for a long time completely misses the
interrupt due to a decrementer rollover.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Benjamin Herrenschmidt 2013-06-15 12:13:40 +10:00 committed by Greg Kroah-Hartman
parent 0031e5e3e3
commit 05266fa348
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/irq.c
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@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
* in case we also had a rollover while hard disabled
*/
local_paca->irq_happened &= ~PACA_IRQ_DEC;
if (decrementer_check_overflow())
if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
return 0x900;
/* Finally check if an external interrupt happened */