[patch V3 04/35] genirq/msi: Use PCI device property

Thomas Gleixner
2021-12-10T22:19:11Z

From: Thomas Gleixner <tglx@linutronix.de>

to determine whether this is MSI or MSIX instead of consulting MSI
descriptors.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: Use PCI device property - Jason
---
kernel/irq/msi.c | 17 ++---------------
1 file changed, 2 insertions(+), 15 deletions(-)

--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -77,21 +77,8 @@ EXPORT_SYMBOL_GPL(get_cached_msi_msg);
static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct msi_desc *entry;
- bool is_msix = false;
- unsigned long irq;
- int retval;
-
- retval = kstrtoul(attr->attr.name, 10, &irq);
- if (retval)
- return retval;
-
- entry = irq_get_msi_desc(irq);
- if (!entry)
- return -ENODEV;
-
- if (dev_is_pci(dev))
- is_msix = entry->pci.msi_attrib.is_msix;
+ /* MSI vs. MSIX is per device not per interrupt */
+ bool is_msix = dev_is_pci(dev) ? to_pci_dev(dev)->msix_enabled : false;

return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi");
}