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irqchip/gic-v3-its: Fix LPI release for Multi-MSI devices 

When allocating a range of LPIs for a Multi-MSI capable device,
this allocation extended to the closest power of 2.

But on the release path, the interrupts are released one by
one. This results in not releasing the "extra" range, leaking
the its_device. Trying to reprobe the device will then fail.

Fix it by releasing the LPIs the same way we allocate them.

Fixes: 8208d1708b ("irqchip/gic-v3-its: Align PCI Multi-MSI allocation on their size")
Reported-by: Jiaxing Luo <luojiaxing@huawei.com>
Tested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/f5e948aa-e32f-3f74-ae30-31fee06c2a74@huawei.com
This commit is contained in:
Marc Zyngier 2019-09-05 14:56:47 +01:00
parent e89327f659
commit c9c96e30ec
1 changed files with 4 additions and 5 deletions
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9
drivers/irqchip/irq-gic-v3-its.c
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@ -2641,14 +2641,13 @@ static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
struct its_node *its = its_dev->its;
int i;
bitmap_release_region(its_dev->event_map.lpi_map,
its_get_event_id(irq_domain_get_irq_data(domain, virq)),
get_count_order(nr_irqs));
for (i = 0; i < nr_irqs; i++) {
struct irq_data *data = irq_domain_get_irq_data(domain,
virq + i);
u32 event = its_get_event_id(data);
/* Mark interrupt index as unused */
clear_bit(event, its_dev->event_map.lpi_map);
/* Nuke the entry in the domain */
irq_domain_reset_irq_data(data);
}