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Subject[patch 2/5] gpio-langwell-fix-crap.patch
commit 0766d20fd (langwell_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.

#3) Just mechanically changing eoi to irq_eoi without checking the
background of that change is sloppy at best.

Remove the sillyness and retrieve the interrupt data from irq_desc
directly. No need to go through a sparse irq lookup.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Alek Du <alek.du@intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
drivers/gpio/langwell_gpio.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
Index: linux-2.6-tip/drivers/gpio/langwell_gpio.c
===================================================================
--- linux-2.6-tip.orig/drivers/gpio/langwell_gpio.c
+++ linux-2.6-tip/drivers/gpio/langwell_gpio.c
@@ -187,10 +187,11 @@ MODULE_DEVICE_TABLE(pci, lnw_gpio_ids);

static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
{
- struct lnw_gpio *lnw = get_irq_data(irq);
- u32 base, gpio;
+ struct irq_data *data = irq_desc_get_irq_data(desc);
+ struct lnw_gpio *lnw = irq_data_get_irq_handler_data(data);
+ struct irq_chip *chip = irq_data_get_irq_chip(data);
+ u32 base, gpio, gedr_v;
void __iomem *gedr;
- u32 gedr_v;

/* check GPIO controller to check which pin triggered the interrupt */
for (base = 0; base < lnw->chip.ngpio; base += 32) {
@@ -207,11 +208,7 @@ static void lnw_irq_handler(unsigned irq
writel(gedr_v, gedr);
}

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

static int __devinit lnw_gpio_probe(struct pci_dev *pdev,



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