[patch 03/37] PCI/MSI: Allocate MSI device data on first use

Thomas Gleixner
2021-11-27T01:26:02Z

Allocate MSI device data on first use, i.e. when a PCI driver invokes one
of the PCI/MSI enablement functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
drivers/pci/msi/msi.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)

--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -889,10 +889,12 @@ static int __pci_enable_msi_range(struct
/* deprecated, don't use */
int pci_enable_msi(struct pci_dev *dev)
{
- int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
- if (rc < 0)
- return rc;
- return 0;
+ int rc = msi_setup_device_data(&dev->dev);
+
+ if (!rc)
+ rc = __pci_enable_msi_range(dev, 1, 1, NULL);
+
+ return rc < 0 ? rc : 0;
}
EXPORT_SYMBOL(pci_enable_msi);

@@ -947,7 +949,11 @@ static int __pci_enable_msix_range(struc
int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
int minvec, int maxvec)
{
- return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
+ int ret = msi_setup_device_data(&dev->dev);
+
+ if (!ret)
+ ret = __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
+ return ret;
}
EXPORT_SYMBOL(pci_enable_msix_range);

@@ -974,8 +980,12 @@ int pci_alloc_irq_vectors_affinity(struc
struct irq_affinity *affd)
{
struct irq_affinity msi_default_affd = {0};
+ int ret = msi_setup_device_data(&dev->dev);
int nvecs = -ENOSPC;

+ if (ret)
+ return ret;
+
if (flags & PCI_IRQ_AFFINITY) {
if (!affd)
affd = &msi_default_affd;