gpio/dwapb: 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: Linus Walleij <linus.walleij@linaro.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: linux-gpio@vger.kernel.org
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@ -348,8 +348,8 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
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irq_gc->chip_types[1].handler = handle_edge_irq;
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if (!pp->irq_shared) {
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irq_set_chained_handler(pp->irq, dwapb_irq_handler);
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irq_set_handler_data(pp->irq, gpio);
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irq_set_chained_handler_and_data(pp->irq, dwapb_irq_handler,
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gpio);
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} else {
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/*
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* Request a shared IRQ since where MFD would have devices
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