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authorHerve Codina <herve.codina@bootlin.com>2023-10-24 17:03:35 +0200
committerThomas Gleixner <tglx@linutronix.de>2023-10-27 09:15:44 +0200
commit5e7afb2eb7b2a7c81e9f608cbdf74a07606fd1b5 (patch)
treeeba513a251b1d64347caac3a9bcf66549bcea2d3 /kernel/irq/generic-chip.c
parenta0b0bad10587ae2948a7c36ca4ffc206007fbcf3 (diff)
genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware
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: cfefd21e693d ("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
Diffstat (limited to 'kernel/irq/generic-chip.c')
-rw-r--r--kernel/irq/generic-chip.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index 81ecca08caad..d39a40bc542b 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -548,21 +548,34 @@ 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);