linux-kernel - Re: [PATCH] irqchip: mxs: add missing set_handle

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Date:	Fri, 29 Jan 2016 09:54:51 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Oleksij Rempel <linux@...pel-privat.de>
cc:	kernel@...gutronix.de, linux-kernel@...r.kernel.org,
	jason@...edaemon.net, marc.zyngier@....com
Subject: Re: [PATCH] irqchip: mxs: add missing set_handle_irq()

On Fri, 29 Jan 2016, Oleksij Rempel wrote:
> Am 29.01.2016 um 09:33 schrieb Thomas Gleixner:
> > On Fri, 29 Jan 2016, Oleksij Rempel wrote:
> > 
> >> this will fix IRQ related issues on Alphascale ASM9260
> > 
> > This really does not qualify as a changelog.
> > 
> > 1) What's the problem and what consequences does it have
> > 
> > 2) What's the fix.
> > 
> > Thanks,
> > 
> > 	tglx
> > 
> 
> The driver provide this function:
> asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs)
> {
>         u32 irqnr;
> 
>         irqnr = __raw_readl(icoll_priv.stat);
>         __raw_writel(irqnr, icoll_priv.vector);
>         handle_domain_irq(icoll_domain, irqnr, regs);
> }
> 
> i assume at some late review point instead of move it to asm9260_of_init
> i removed it completely. As result, the driver was compilable but not
> working.
> Should i put this explanation to changelog?

So the problem is:

The rework of the driver missed to move the call to set_handle_irq() into
asm9260_of_init(). As a consequence no interrupt entry point is installed and
no interrupts are delivered (or whatever the outcome is, crash, explode ...)

Solution is:

Install the interrupt entry handler.

Right?

And that wants a tag:

Fixes: nnnnnnnnnnnn ("irqchip/......")

So we can mark it for stable.

Thanks,

	tglx