[patch RFC 13/38] PCI: MSI: Rework pci_msi_domain_calc_hwirq()

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

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

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-pci@xxxxxxxxxxxxxxx
---
 arch/x86/kernel/apic/msi.c |    2 +-
 drivers/pci/msi.c          |   13 ++++++-------
 include/linux/msi.h        |    3 +--
 3 files changed, 8 insertions(+), 10 deletions(-)

--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -232,7 +232,7 @@ 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);
 
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1346,17 +1346,17 @@ void pci_msi_domain_write_msg(struct irq
 
 /**
  * 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 *pdev = 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;
+               pci_dev_id(pdev) << 11 |
+               (pci_domain_nr(pdev->bus) & 0xFFFFFFFF) << 27;
 }
 
 static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
@@ -1406,8 +1406,7 @@ static void pci_msi_domain_set_desc(msi_
                                    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
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -369,8 +369,7 @@ void pci_msi_domain_write_msg(struct irq
 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);