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Subject[tip: irq/msi] PCI/MSI: Simplify pci_irq_get_affinity()
The following commit has been merged into the irq/msi branch of tip:

Commit-ID: f48235900182d64537c6e8f8dc0932b57a1a0638
Gitweb: https://git.kernel.org/tip/f48235900182d64537c6e8f8dc0932b57a1a0638
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 10 Dec 2021 23:19:26 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 16 Dec 2021 22:16:41 +01:00

PCI/MSI: Simplify pci_irq_get_affinity()

Replace open coded MSI descriptor chasing and use the proper accessor
functions instead.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211210221814.900929381@linutronix.de

---
drivers/pci/msi/msi.c | 26 ++++++++++----------------
1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
index fad3873..0909b27 100644
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -1104,26 +1104,20 @@ EXPORT_SYMBOL(pci_irq_vector);
*/
const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
{
- if (dev->msix_enabled) {
- struct msi_desc *entry;
+ int irq = pci_irq_vector(dev, nr);
+ struct msi_desc *desc;

- for_each_pci_msi_entry(entry, dev) {
- if (entry->msi_index == nr)
- return &entry->affinity->mask;
- }
- WARN_ON_ONCE(1);
+ if (WARN_ON_ONCE(irq <= 0))
return NULL;
- } else if (dev->msi_enabled) {
- struct msi_desc *entry = first_pci_msi_entry(dev);
-
- if (WARN_ON_ONCE(!entry || !entry->affinity ||
- nr >= entry->nvec_used))
- return NULL;

- return &entry->affinity[nr].mask;
- } else {
+ desc = irq_get_msi_desc(irq);
+ /* Non-MSI does not have the information handy */
+ if (!desc)
return cpu_possible_mask;
- }
+
+ if (WARN_ON_ONCE(!desc->affinity))
+ return NULL;
+ return &desc->affinity[nr].mask;
}
EXPORT_SYMBOL(pci_irq_get_affinity);

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