Messages in this thread Patch in this message | | | Subject | linux/kernel/irq/chip.c IRQ disable, shutdown bug | Date | Fri, 15 Feb 2008 14:10:18 -0000 | From | "Hennerich, Michael" <> |
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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 a empty function.
Looking through various architectures, it's pretty common that disable and shutdown is NULL. So this bug affects many architectures.
This patch fixes the issue.
Best regards, Michael
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; }
/*
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