PCI/keystone: Use irq_data_get_msi_desc() to avoid redundant lookup of irq_data

Use irq_data_get_msi_desc() to avoid redundant lookup of irq_data while we
already have a pointer to corresponding irq_data.
Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: linux-pci@vger.kernel.org
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

drivers/pci/host/pci-keystone-dw.c

@@ -104,14 +104,13 @@ static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
 {
 	u32 offset, reg_offset, bit_pos;
 	struct keystone_pcie *ks_pcie;
-	unsigned int irq = d->irq;
 	struct msi_desc *msi;
 	struct pcie_port *pp;
 
-	msi = irq_get_msi_desc(irq);
+	msi = irq_data_get_msi_desc(d);
 	pp = sys_to_pcie(msi->dev->bus->sysdata);
 	ks_pcie = to_keystone_pcie(pp);
-	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
+	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);
 	update_reg_offset_bit_pos(offset, &reg_offset, &bit_pos);
 
 	writel(BIT(bit_pos),
@@ -142,15 +141,14 @@ void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
 static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
 {
 	struct keystone_pcie *ks_pcie;
-	unsigned int irq = d->irq;
 	struct msi_desc *msi;
 	struct pcie_port *pp;
 	u32 offset;
 
-	msi = irq_get_msi_desc(irq);
+	msi = irq_data_get_msi_desc(d);
 	pp = sys_to_pcie(msi->dev->bus->sysdata);
 	ks_pcie = to_keystone_pcie(pp);
-	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
+	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);
 
 	/* Mask the end point if PVM implemented */
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
@@ -164,15 +162,14 @@ static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
 static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
 {
 	struct keystone_pcie *ks_pcie;
-	unsigned int irq = d->irq;
 	struct msi_desc *msi;
 	struct pcie_port *pp;
 	u32 offset;
 
-	msi = irq_get_msi_desc(irq);
+	msi = irq_data_get_msi_desc(d);
 	pp = sys_to_pcie(msi->dev->bus->sysdata);
 	ks_pcie = to_keystone_pcie(pp);
-	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
+	offset = d->irq - irq_linear_revmap(pp->irq_domain, 0);
 
 	/* Mask the end point if PVM implemented */
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {