[PATCH] powerpc/powernv: Fix unbalanced IRQ warning in eeh-powernv.c

[Michael Ellerman]

To avoid EEH getting invoked repeatedly for the same error, the OPAL
interrupt that invokes EEH is masked at the start of the process.

Currently, pnv_eeh_next_error() re-enables the interrupt but it gets
called from a loop if there are more outstanding events to process.
This causes an unbalanced enable warning.

Check that there are no more errors before enabling interrupts.

Fixed-by: Alistair Popple <alistair at popple.id.au>
Tested-by: Daniel Axtens <dja at axtens.net> [and changelog]
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/platforms/powernv/eeh-powernv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 5cf5e6ea213b..7cf0df859d05 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -1478,7 +1478,7 @@ static int pnv_eeh_next_error(struct eeh_pe **pe)
 	}
 
 	/* Unmask the event */
-	if (eeh_enabled())
+	if (ret == EEH_NEXT_ERR_NONE && eeh_enabled())
 		enable_irq(eeh_event_irq);
 
 	return ret;
-- 
2.1.4