Commit a2cb9aeb authored by Marc Zyngier's avatar Marc Zyngier Committed by Linus Torvalds

gpio: fix pca953x set_type 'scheduling while atomic' bug

Bill Gatliff reported the following bug when using the irq_chip facility
of the pca953x driver on a PPC platform:

BUG: scheduling while atomic: insmod/1530/0x00000002

He traced it back to an i2c transaction in pca953x_irq_set_type(), which
can be called with interrupt disabled (from __setup_irq()).  As the i2c
controller can sleep while sending a message, this qualifies as a bad
idea.

This patch moves the i2c transaction to pca953x_irq_bus_sync_unlock(),
where it is actually safe to send an i2c message.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: default avatarMarc Zyngier <maz@misterjones.org>
Reported-by: default avatarBill Gatliff <bgat@billgatliff.com>
Cc: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3835541d
...@@ -252,6 +252,18 @@ static void pca953x_irq_bus_lock(unsigned int irq) ...@@ -252,6 +252,18 @@ static void pca953x_irq_bus_lock(unsigned int irq)
static void pca953x_irq_bus_sync_unlock(unsigned int irq) static void pca953x_irq_bus_sync_unlock(unsigned int irq)
{ {
struct pca953x_chip *chip = get_irq_chip_data(irq); struct pca953x_chip *chip = get_irq_chip_data(irq);
uint16_t new_irqs;
uint16_t level;
/* Look for any newly setup interrupt */
new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;
new_irqs &= ~chip->reg_direction;
while (new_irqs) {
level = __ffs(new_irqs);
pca953x_gpio_direction_input(&chip->gpio_chip, level);
new_irqs &= ~(1 << level);
}
mutex_unlock(&chip->irq_lock); mutex_unlock(&chip->irq_lock);
} }
...@@ -278,7 +290,7 @@ static int pca953x_irq_set_type(unsigned int irq, unsigned int type) ...@@ -278,7 +290,7 @@ static int pca953x_irq_set_type(unsigned int irq, unsigned int type)
else else
chip->irq_trig_raise &= ~mask; chip->irq_trig_raise &= ~mask;
return pca953x_gpio_direction_input(&chip->gpio_chip, level); return 0;
} }
static struct irq_chip pca953x_irq_chip = { static struct irq_chip pca953x_irq_chip = {
......
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