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

[ Upstream commit c9c96e30ecaa0aafa225aa1a5392cb7db17c7a82 ]

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: 8208d1708b88 ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9ba73e11757d9d43e5a5e55e558bd3b4d8dbc896..e7549a2b1482bef4628de7724dc2de5aaac0fde1 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2514,14 +2514,13 @@ 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);
        }