genirq/msi: Return MSI_XA_DOMAIN_SIZE as the maximum MSI index when no domain is...

On architectures such as s390 that do not use irq domains for MSI,
returning 0 as the maximum MSI index is a bit counter-productive,
as it indicates that no MSI can be allocated. Bad idea.

Instead, return the maximum we're willing to support in the MSI
backing store (MSI_XA_DOMAIN_SIZE), and let the arch code do its
usual thing.

Thanks to Matthew Rosato for fixing the fix.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[maz: commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/87fsdgzpqs.ffs@tglx

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index e843604..955267b 100644 (file)
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -610,8 +610,8 @@ static unsigned int msi_domain_get_hwsize(struct device *dev, unsigned int domid
                info = domain->host_data;
                return info->hwsize;
        }
-       /* No domain, no size... */
-       return 0;
+       /* No domain, default to MSI_XA_DOMAIN_SIZE */
+       return MSI_XA_DOMAIN_SIZE;
 }
 
 static inline void irq_chip_write_msi_msg(struct irq_data *data,