Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1185961 > unrolled thread

Re: [PATCH 2/2] at91: use request_irq/free_irq instead of setup_irq/remove_irq

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH 2/2] at91: use request_irq/free_irq instead of  setup_irq/remove_irq Alexandre Belloni <alexandre.belloni@free-electrons.com> - 2015-07-16 17:30 +0200

#1185961 — Re: [PATCH 2/2] at91: use request_irq/free_irq instead of setup_irq/remove_irq

Hi,

On 05/07/2015 at 23:48:26 +0200, Thomas Gleixner wrote :
> On Fri, 3 Jul 2015, David Dueck wrote:
> 
> > This fixes a warning when using RT-Preempt.
> 
> That's not a proper explanation for the patch and by all means it
> cannot fix anything because free_irq() is just a different wrapper
> around __free_irq() than remove_irq(). So how on earth fixes that the
> problem at hand?
> 

Hum, that is quite simple, the following patch
http://git.kernel.org/cgit/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=227cd21851456fb08e87f5a35e0e51280a9fd439
bitrotted and should be rewritten completely or at least dropped.

For drivers/clocksource/timer-atmel-st.c, the patch is broken since at
least 3.18 as NR_IRQS_LEGACY + AT91_ID_SYS is 17 and the actual irq
allocated by irq_of_parse_and_map is 16.
Since 4.1, AT91_ID_SYS doesn't exist anymore and this is not compiling
at all.

For drivers/clocksource/timer-atmel-pit.c, struct irqaction
at91sam926x_pit_irq is never initialized but then it is used in
setup_irq()/remove_irq(). This basically ends up registering a null
handler for IRQ 0.

I'm preparing a replacement patch. I'd even say that this is probably
something we would want to mainline. Meanwhile, can you drop the
mentioned patch?

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web