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Message-ID: <alpine.DEB.2.11.1505202041280.4225@nanos>
Date: Wed, 20 May 2015 20:43:16 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Jiang Liu <jiang.liu@...ux.intel.com>
cc: Bjorn Helgaas <bhelgaas@...gle.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Randy Dunlap <rdunlap@...radead.org>,
Yinghai Lu <yinghai@...nel.org>,
Borislav Petkov <bp@...en8.de>,
Dan Williams <dan.j.williams@...el.com>,
Vinod Koul <vinod.koul@...el.com>,
Murali Karicheri <m-karicheri2@...com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Steve Longerbeam <slongerbeam@...il.com>,
Gilad Avidov <gavidov@...eaurora.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Tony Luck <tony.luck@...el.com>, x86@...nel.org,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-acpi@...r.kernel.org, dmaengine@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC v1 25/25] genirq: Kill the first parameter 'irq' of
irq_flow_handler_t
On Wed, 20 May 2015, Jiang Liu wrote:
> On 2015/5/20 23:40, Thomas Gleixner wrote:
> > On Wed, 20 May 2015, Jiang Liu wrote:
> >> /* Chained IRQ handler for IPU error interrupt */
> >> -static void ipu_irq_err(unsigned int irq, struct irq_desc *desc)
> >> +static void ipu_irq_err(struct irq_desc *desc)
> >> {
> >> + unsigned int irq = irq_desc_to_irq(desc);
> >
> > Why initializing? It's overwritten in the loop.
> Hi Thomas,
>
> I'm not familiar with the hardware, but if src2map() returns 0
> on the first call, we need to initialize irq. Otherwise
> generic_handle_irq(irq) will use random value on the first call.
> ---------------------------------------------------------
> map = src2map(32 * i + line);
> if (map)
> irq = map->irq;
You omitted the following code:
raw_spin_unlock(&bank_lock);
if (!map) {
pr_err("IPU: Interrupt on unmapped source %u bank %d\n",
line, i);
continue;
}
So you it does not use irq if map is 0.
Thanks,
tglx
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