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gpio/langwell: Fix broken irq_eoi change.

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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>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Thomas Gleixner 2011-03-17 19:32:49 +00:00 committed by Grant Likely
parent 61ab3fe57e
commit 20e2aa916f
1 changed files with 5 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpio/langwell_gpio.c
View File

@ -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, struct irq_desc *desc)
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,