linux-kernel - RE: [PATCH 1/4] x86_64 io_apic: Implement remove_pin_to

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Date:	Mon, 8 Jan 2007 13:46:49 -0800
From:	"Lu, Yinghai" <yinghai.lu@....com>
To:	ebiederm@...ssion.com
cc:	"Linus Torvalds" <torvalds@...l.org>,
	"Tobias Diedrich" <ranma+kernel@...edrich.de>,
	"Andrew Morton" <akpm@...l.org>, "Adrian Bunk" <bunk@...sta.de>,
	"Andi Kleen" <ak@...e.de>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] x86_64 io_apic: Implement remove_pin_to_irq



-----Original Message-----
From: ebiederm@...ssion.com [mailto:ebiederm@...ssion.com] 
Sent: Monday, January 08, 2007 1:31 PM
To: Lu, Yinghai
Cc: Linus Torvalds; Tobias Diedrich; Andrew Morton; Adrian Bunk; Andi
Kleen; Linux Kernel Mailing List
Subject: Re: [PATCH 1/4] x86_64 io_apic: Implement remove_pin_to_irq

>Any updates to add_pin_to_irq are wrong.  It works fine.  If there
>is something wrong we need to fix remove_pin_to_irq.

>What is the problem you see?  Sorry I'm dense at the moment.

+static int check_timer_pin(int apic, int pin) {
+	int irq, idx;
+	/* 
+	 * Test the architecture default i8254 timer pin
+	 * of apic 0 pin 2.
+	 */
+
+
+	/* If the apic pin pair is in use by another irq fail */
+	irq = irq_from_pin(apic, pin);
+	if ((irq != -1) && (irq != 0)) {
+		apic_printk(APIC_VERBOSE,KERN_INFO "...apic %d pin % in
use by irq %d\n",
+			apic, pin, irq);
+		return 0; 
+	}
+
+	/* Add an entry in mp_irqs for irq 0 */
+	idx = update_irq0_entry(apic, pin);
+
+	/* Add an entry in irq_to_pin */
+	add_pin_to_irq(0, apic, pin);
+
+	/* Now setup the irq */
+	setup_IO_APIC_irq(apic, pin, idx, 0);
+
+	/* And finally check to see if the irq works */
+	return do_check_timer_pin(apic, pin);
+}
+

In the check_timer_pin, irq_from_pin could return 0, it mean some entry
is for IRQ0 already.
The add_pin_to_irq could add another same entry for it again.

YH


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