gpiolib: allow nested threaded irqs for poll(2)

The pca953x driver requires the use of threaded irqs as its irq
demultiplexer can sleep.  Our irq handler can be called from any context,
so use request_any_context_irq to allow threaded irqs as well.

Signed-off-by: Daniel Gl?ckner <dg@emlix.com>
Reported-by: Ian Jeffray <ian@jeffray.co.uk>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 8a29404985f17fda266c03c42c02671c496f3d3f..21da9c19a0cba82e1a8aba6aa52056953efb4f82 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -386,9 +386,9 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
                }
        }
 
-       ret = request_irq(irq, gpio_sysfs_irq, irq_flags,
+       ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
                                "gpiolib", value_sd);
-       if (ret)
+       if (ret < 0)
                goto free_id;
 
        desc->flags |= gpio_flags;