mfd/asic3: Fix race in installing chained IRQ handler

Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().

Search and conversion was done with coccinelle:

@@
expression E1, E2, E3;
@@
(
-if (irq_set_chained_handler(E1, E3) != 0)
-   BUG();
|
-irq_set_chained_handler(E1, E3);
)
-irq_set_handler_data(E1, E2);
+irq_set_chained_handler_and_data(E1, E3, E2);

@@
expression E1, E2, E3;
@@
(
-if (irq_set_chained_handler(E1, E3) != 0)
-   BUG();
...
|
-irq_set_chained_handler(E1, E3);
...
)
-irq_set_handler_data(E1, E2);
+irq_set_chained_handler_and_data(E1, E3, E2);

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index 977bd3a..120df5c 100644 (file)
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -417,9 +417,8 @@ static int __init asic3_irq_probe(struct platform_device *pdev)
        asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
                             ASIC3_INTMASK_GINTMASK);
 
-       irq_set_chained_handler(asic->irq_nr, asic3_irq_demux);
+       irq_set_chained_handler_and_data(asic->irq_nr, asic3_irq_demux, asic);
        irq_set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
-       irq_set_handler_data(asic->irq_nr, asic);
 
        return 0;
 }