linux-kernel - [BUG][RFC] [GENERIC IRQ] irq_chip_set

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Date:	Mon, 18 Feb 2008 16:58:02 -0000
From:	"Hennerich, Michael" <Michael.Hennerich@...log.com>
To:	<tglx@...utronix.de>, <mingo@...e.hu>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [BUG][RFC] [GENERIC IRQ] irq_chip_set_defaults shutdown / disable

RESENT: Add Maintainers 

free_irq() does not disable/mask the irq, in case disable or shutdown in struct irq_chip is left uninitilazied.

/**
 * struct irq_chip - hardware interrupt chip descriptor
 *
 * @name:	name for /proc/interrupts
 * @startup:	start up the interrupt (defaults to ->enable if NULL)
 * @shutdown:	shut down the interrupt (defaults to ->disable if NULL)
 * @enable:		enable the interrupt (defaults to chip->unmask if NULL)
 * @disable:	disable the interrupt (defaults to chip->mask if NULL)


According to linux/irq.h struct irq_chip information,
chip->disable should default to chip->mask if NULL.
However irq_chip_set_defaults(struct irq_chip *chip) will set it to default_disable an empty function.

In earlier kernel versions such as 2.6.19 default_disable called chip->mask.
In 2.6.22 and 2.6.24 default_disable is an empty function.

Looking through various architectures, it's still pretty common that disable and shutdown is NULL.

Do I miss something here?

Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>

Index: irq/chip.c
===================================================================
--- irq/chip.c  (revision 4276)
+++ irq/chip.c  (working copy)
@@ -233,6 +233,10 @@
  */
 static void default_disable(unsigned int irq)  {
+       struct irq_desc *desc = irq_desc + irq;
+
+       desc->chip->mask(irq);
+       desc->status |= IRQ_MASKED;
 }

 /*

Best regards,
Michael

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