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genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware

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commit 5e7afb2eb7b2a7c81e9f608cbdf74a07606fd1b5 upstream.

irq_remove_generic_chip() calculates the Linux interrupt number for removing the
handler and interrupt chip based on gc::irq_base as a linear function of
the bit positions of set bits in the @msk argument.

When the generic chip is present in an irq domain, i.e. created with a call
to irq_alloc_domain_generic_chips(), gc::irq_base contains not the base
Linux interrupt number.  It contains the base hardware interrupt for this
chip. It is set to 0 for the first chip in the domain, 0 + N for the next
chip, where $N is the number of hardware interrupts per chip.

That means the Linux interrupt number cannot be calculated based on
gc::irq_base for irqdomain based chips without a domain map lookup, which
is currently missing.

Rework the code to take the irqdomain case into account and calculate the
Linux interrupt number by a irqdomain lookup of the domain specific
hardware interrupt number.

[ tglx: Massage changelog. Reshuffle the logic and add a proper comment. ]

Fixes: cfefd21e69 ("genirq: Add chip suspend and resume callbacks")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20231024150335.322282-1-herve.codina@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Herve Codina 2023-10-24 17:03:35 +02:00 committed by Greg Kroah-Hartman
parent 683c562c43
commit a438322e00
1 changed files with 19 additions and 6 deletions
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25
kernel/irq/generic-chip.c
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@ -537,21 +537,34 @@ EXPORT_SYMBOL_GPL(irq_setup_alt_chip);
void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
unsigned int clr, unsigned int set)
{
unsigned int i = gc->irq_base;
unsigned int i, virq;
raw_spin_lock(&gc_lock);
list_del(&gc->list);
raw_spin_unlock(&gc_lock);
for (; msk; msk >>= 1, i++) {
for (i = 0; msk; msk >>= 1, i++) {
if (!(msk & 0x01))
continue;
/*
* Interrupt domain based chips store the base hardware
* interrupt number in gc::irq_base. Otherwise gc::irq_base
* contains the base Linux interrupt number.
*/
if (gc->domain) {
virq = irq_find_mapping(gc->domain, gc->irq_base + i);
if (!virq)
continue;
} else {
virq = gc->irq_base + i;
}
/* Remove handler first. That will mask the irq line */
irq_set_handler(i, NULL);
irq_set_chip(i, &no_irq_chip);
irq_set_chip_data(i, NULL);
irq_modify_status(i, clr, set);
irq_set_handler(virq, NULL);
irq_set_chip(virq, &no_irq_chip);
irq_set_chip_data(virq, NULL);
irq_modify_status(virq, clr, set);
}
}
EXPORT_SYMBOL_GPL(irq_remove_generic_chip);