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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-15 12:13:40 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-20 11:58:47 -0700
commit05266fa348c3a30a3fef2c2993ca73e28b17232f (patch)
tree708ae5fff5f3c304fcd40b96c20a145613cee4c3
parent0031e5e3e3cd8a21fe1224e0e51d646ca4099eab (diff)
powerpc: Fix missing/delayed calls to irq_work
commit 230b3034793247f61e6a0b08c44cf415f6d92981 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>
-rw-r--r--arch/powerpc/kernel/irq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index d7ebc58c907b..071592bbe025 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -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 */