[PATCH] irqchip/irq-msi-lib: free wired MSI descriptors

[Avi Weiss]

msi_device_domain_alloc_wired() allocates a descriptor for each
interrupt, but wired MSI domains do not set MSI_FLAG_FREE_MSI_DESCS.
msi_device_domain_free_wired() releases the IRQ without freeing its
descriptor, eventually exhausting the domain. Failed allocations also
leave descriptors behind.

Set MSI_FLAG_FREE_MSI_DESCS for wired MSI domains so both paths
release the descriptors.

Fixes: 64a855324311 ("irqchip/irq-msi-lib: Prepare for DOMAIN_BUS_WIRED_TO_MSI")
Signed-off-by: Avi Weiss <thnkslprpt@xxxxxxxxx>
---
 drivers/irqchip/irq-msi-lib.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c
index 45e0ed3134ce1..a1e12aa820e7d 100644
--- a/drivers/irqchip/irq-msi-lib.c
+++ b/drivers/irqchip/irq-msi-lib.c
@@ -75,6 +75,7 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
 		info->flags = MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
 		fallthrough;
 	case DOMAIN_BUS_WIRED_TO_MSI:
+		info->flags |= MSI_FLAG_FREE_MSI_DESCS;
 		/* Remove PCI specific flags */
 		required_flags &= ~MSI_FLAG_PCI_MSI_MASK_PARENT;
 		break;
-- 
2.43.0