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authorJohn Keeping <john@metanate.com>2017-09-06 12:35:40 +0300
committerThomas Gleixner <tglx@linutronix.de>2017-09-06 12:41:20 +0300
commit596a7a1d0989c621c3ae49be73a1d1f9de22eb5a (patch)
treea5f9b759449436534e6297e7ea5cd1bbede2094a /kernel/irq/msi.c
parent24e700e291d52bd200212487e2b654c0aa3f07a2 (diff)
downloadlinux-596a7a1d0989c621c3ae49be73a1d1f9de22eb5a.tar.xz
genirq/msi: Fix populating multiple interrupts
On allocating the interrupts routed via a wire-to-MSI bridge, the allocator iterates over the MSI descriptors to build the hierarchy, but fails to use the descriptor interrupt number, and instead uses the base number, generating the wrong IRQ domain mappings. The fix is to use the MSI descriptor interrupt number when setting up the interrupt instead of the base interrupt for the allocation range. The only saving grace is that although the MSI descriptors are allocated in bulk, the wired interrupts are only allocated one by one (so desc->irq == virq) and the bug went unnoticed so far. Fixes: 2145ac9310b60 ("genirq/msi: Add msi_domain_populate_irqs") Signed-off-by: John Keeping <john@metanate.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20170906103540.373864a2.john@metanate.com
Diffstat (limited to 'kernel/irq/msi.c')
-rw-r--r--kernel/irq/msi.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 48eadf416c24..3fa4bd59f569 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -315,11 +315,12 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
ops->set_desc(arg, desc);
/* Assumes the domain mutex is held! */
- ret = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
+ ret = irq_domain_alloc_irqs_hierarchy(domain, desc->irq, 1,
+ arg);
if (ret)
break;
- irq_set_msi_desc_off(virq, 0, desc);
+ irq_set_msi_desc_off(desc->irq, 0, desc);
}
if (ret) {