[patch] genirq/msi: Populate sysfs entry only once

Thomas Gleixner
2022-01-10T18:12:50Z

The MSI entries for multi-MSI are populated en bloc for the MSI descriptor,
but the current code invokes the population inside the per interrupt loop
which triggers a warning in the sysfs code and causes the interrupt
allocation to fail.

Move it outside of the loop so it works correctly for single and multi-MSI.

Fixes: bf5e758f02fc ("genirq/msi: Simplify sysfs handling")
Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/irq/msi.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -887,12 +887,11 @@ int __msi_domain_alloc_irqs(struct irq_d
ret = msi_init_virq(domain, virq + i, vflags);
if (ret)
return ret;
-
- if (info->flags & MSI_FLAG_DEV_SYSFS) {
- ret = msi_sysfs_populate_desc(dev, desc);
- if (ret)
- return ret;
- }
+ }
+ if (info->flags & MSI_FLAG_DEV_SYSFS) {
+ ret = msi_sysfs_populate_desc(dev, desc);
+ if (ret)
+ return ret;
}
allocated++;
}