platform-drivers: x86: pmic: Fix up bogus irq hackery

commit 456dc301([PATCH] intel_pmic_gpio: modify EOI handling following
change of kernel irq subsystem) changes

- desc->chip->eoi(irq);
+
+ if (desc->chip->irq_eoi)
+ desc->chip->irq_eoi(irq_get_irq_data(irq));
+ else
+ dev_warn(pg->chip.dev, "missing EOI handler for irq %d\n", irq);

With the following explanation:

"Latest kernel has many changes in IRQ subsystem and its interfaces,
like adding irq_eoi" for struct irq_chip, this patch will make it
support both the new and old interface."

This is completely bogus.

#1) The changelog does not match the patch at all

#2) This driver relies on the assumption that it sits behind an eoi
capable interrupt line. If the implementation of the underlying
chip changes from eoi to irq_eoi then this driver has to follow
that change and not add a total bogosity.

Remove the sillyness and retrieve the interrupt data from irq_desc
directly. No need to got through circles to look it up.

Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Feng Tang <[e-mail]>
Cc: Matthew Garrett <[e-mail]>
Cc: Alan Cox <[e-mail]>
Cc: Alek Du <[e-mail]>
Signed-off-by: Matthew Garrett <[e-mail]>

drivers/platform/x86/intel_pmic_gpio.c

···
 			generic_handle_irq(pg->irq_base + gpio);
 		}
 	}
-
-	if (desc->chip->irq_eoi)
-		desc->chip->irq_eoi(irq_get_irq_data(irq));
-	else
-		dev_warn(pg->chip.dev, "missing EOI handler for irq %d\n", irq);
+	desc->chip->irq_eoi(get_irq_desc_chip_data(desc));
 }
 
 static int __devinit platform_pmic_gpio_probe(struct platform_device *pdev)