Hi folks,
After shared interrupt line with CONFIG_PREEMPT_HARDIRQS issue, I found
another problem with the gpio "interrupt on level change" management on
AT91RM9200.
>From the point of view of linux, there is to struct irqchip :
- one dealing with the interrupt controller (AIC)
- another one dealing with PIO controllers to mask and unmask interrupts
from gpios
The second one is cascaded with the first one through 4 irq lines (one for
each PIO controller, therefore 4 PIO controllers) using
set_irq_chained_handler.
After registering theses irqs, the gpio_irq_handler is correctly called on
gpio irqs...
However, when calling desc->chip->mask, the function at91rm9200_mask_irq is
called instead of gpio_mask_irq !
at91rm9200_mask_irq is registered on the first AIC struct irqchip.
I'm using linux-2.6.16-at91-rt23 with CONFIG_PREEMPT_HARDIRQS=yes
I have rewrite gpio_irq_handler as :
static void gpio_irq_handler(unsigned int irq, struct irqdesc* desc, struct
pt_regs* regs)
{
desc->chip->mask(irq);
desc->chip->unmask(irq);
}
As desc->chip->(un)mask(irq) doesn't acknowledge the PIO controller, kernel
loops in ISR...
What's wrong with desc->chip->mask ?
Regards
Yann Leprovost
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
