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irqchip/irq-msi-lib: Free wired MSI descriptors

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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: 64a8553243 ("irqchip/irq-msi-lib: Prepare for DOMAIN_BUS_WIRED_TO_MSI")
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261025122058.2180685-1-thnkslprpt@gmail.com
This commit is contained in:
Avi Weiss 2026-10-25 14:20:58 +02:00 committed by Thomas Gleixner
parent a2f482407d
commit 1c16bc2b11
1 changed files with 1 additions and 0 deletions
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drivers/irqchip/irq-msi-lib.c
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@ -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;