[tip: x86/irq] PCI/MSI: Rework pci_msi_domain_calc_hwirq()

["tip-bot2 for Thomas Gleixner" <tip-bot2@xxxxxxxxxxxxx>]

The following commit has been merged into the x86/irq branch of tip:

Commit-ID:     dfb9eb7cf6cd0c0b0f2a1111fcc47b0a297b097d
Gitweb:        https://git.kernel.org/tip/dfb9eb7cf6cd0c0b0f2a1111fcc47b0a297b097d
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Wed, 26 Aug 2020 13:16:45 +02:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Wed, 16 Sep 2020 16:52:34 +02:00

PCI/MSI: Rework pci_msi_domain_calc_hwirq()

Retrieve the PCI device from the msi descriptor instead of doing so at the
call sites.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200826112332.352583299@xxxxxxxxxxxxx

---
 arch/x86/kernel/apic/msi.c |  2 +-
 drivers/pci/msi.c          |  9 ++++-----
 include/linux/msi.h        |  3 +--
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index ebf57db..6d7655b 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -231,7 +231,7 @@ EXPORT_SYMBOL_GPL(pci_msi_prepare);
 
 void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 {
-	arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
+	arg->msi_hwirq = pci_msi_domain_calc_hwirq(desc);
 }
 EXPORT_SYMBOL_GPL(pci_msi_set_desc);
 
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 30ae4ff..9af58a2 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1346,14 +1346,14 @@ void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
 
 /**
  * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
- * @dev:	Pointer to the PCI device
  * @desc:	Pointer to the MSI descriptor
  *
  * The ID number is only used within the irqdomain.
  */
-irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
-					  struct msi_desc *desc)
+irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
 {
+	struct pci_dev *dev = msi_desc_to_pci_dev(desc);
+
 	return (irq_hw_number_t)desc->msi_attrib.entry_nr |
 		pci_dev_id(dev) << 11 |
 		(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
@@ -1406,8 +1406,7 @@ static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
 				    struct msi_desc *desc)
 {
 	arg->desc = desc;
-	arg->hwirq = pci_msi_domain_calc_hwirq(msi_desc_to_pci_dev(desc),
-					       desc);
+	arg->hwirq = pci_msi_domain_calc_hwirq(desc);
 }
 #else
 #define pci_msi_domain_set_desc		NULL
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 8ad679e..d360cc7 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -369,8 +369,7 @@ void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 					     struct msi_domain_info *info,
 					     struct irq_domain *parent);
-irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
-					  struct msi_desc *desc);
+irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc);
 int pci_msi_domain_check_cap(struct irq_domain *domain,
 			     struct msi_domain_info *info, struct device *dev);
 u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);