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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-12-16 11:08:52 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-12-16 14:04:04 +0000 |
| commit | e982ad82bd8f7931f5788a15dfa3709f7a7ee79f (patch) | |
| tree | c8ddc0ae0cc97550b9e4edc9a84574b741863373 /kernel/irq | |
| parent | db3568fd80a3999413c04ea0cf52596b7b0ad9aa (diff) | |
| download | linux-e982ad82bd8f7931f5788a15dfa3709f7a7ee79f.tar.gz | |
genirq/msi: Return MSI_XA_DOMAIN_SIZE as the maximum MSI index when no domain is present
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
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/msi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index e843604c3a4f6..955267bbc2be6 100644 --- 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, |