[PATCH v2 01/22] PCI/MSI: Clean up struct msi_chip argument

[Yijing Wang]

Msi_chip functions setup_irq/teardown_irq rarely use msi_chip
argument. We can look up msi_chip pointer by the device pointer
or irq number, so clean up msi_chip argument.

Signed-off-by: Yijing Wang <wangyijing at huawei.com>
CC: Thierry Reding <thierry.reding at gmail.com>
CC: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 drivers/irqchip/irq-armada-370-xp.c |    8 +++-----
 drivers/pci/host/pci-tegra.c        |    8 +++++---
 drivers/pci/host/pcie-designware.c  |    4 ++--
 drivers/pci/host/pcie-rcar.c        |    8 +++++---
 drivers/pci/msi.c                   |    4 ++--
 include/linux/msi.h                 |    5 ++---
 6 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index df60eab..3909d06 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -129,9 +129,8 @@ static void armada_370_xp_free_msi(int hwirq)
 	mutex_unlock(&msi_used_lock);
 }
 
-static int armada_370_xp_setup_msi_irq(struct msi_chip *chip,
-				       struct pci_dev *pdev,
-				       struct msi_desc *desc)
+static int armada_370_xp_setup_msi_irq(struct pci_dev *pdev, 
+		struct msi_desc *desc)
 {
 	struct msi_msg msg;
 	int virq, hwirq;
@@ -160,8 +159,7 @@ static int armada_370_xp_setup_msi_irq(struct msi_chip *chip,
 	return 0;
 }
 
-static void armada_370_xp_teardown_msi_irq(struct msi_chip *chip,
-					   unsigned int irq)
+static void armada_370_xp_teardown_msi_irq(unsigned int irq)
 {
 	struct irq_data *d = irq_get_irq_data(irq);
 	unsigned long hwirq = d->hwirq;
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 0fb0fdb..edd4040 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -1157,9 +1157,10 @@ static irqreturn_t tegra_pcie_msi_irq(int irq, void *data)
 	return processed > 0 ? IRQ_HANDLED : IRQ_NONE;
 }
 
-static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
+static int tegra_msi_setup_irq(struct pci_dev *pdev,
 			       struct msi_desc *desc)
 {
+	struct msi_chip *chip = pdev->bus->msi;
 	struct tegra_msi *msi = to_tegra_msi(chip);
 	struct msi_msg msg;
 	unsigned int irq;
@@ -1185,10 +1186,11 @@ static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
 	return 0;
 }
 
-static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
+static void tegra_msi_teardown_irq(unsigned int irq)
 {
-	struct tegra_msi *msi = to_tegra_msi(chip);
 	struct irq_data *d = irq_get_irq_data(irq);
+	struct msi_chip *chip = irq_get_chip_data(irq);
+	struct tegra_msi *msi = to_tegra_msi(chip);
 
 	tegra_msi_free(msi, d->hwirq);
 }
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index fa2fa45..517f1e1 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -342,7 +342,7 @@ static void clear_irq(unsigned int irq)
 	msi->msi_attrib.multiple = 0;
 }
 
-static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
+static int dw_msi_setup_irq(struct pci_dev *pdev,
 			struct msi_desc *desc)
 {
 	int irq, pos, msgvec;
@@ -383,7 +383,7 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
 	return 0;
 }
 
-static void dw_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
+static void dw_msi_teardown_irq(unsigned int irq)
 {
 	clear_irq(irq);
 }
diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 4884ee5..647bc9f 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -615,9 +615,10 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static int rcar_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
+static int rcar_msi_setup_irq(struct pci_dev *pdev,
 			      struct msi_desc *desc)
 {
+	struct msi_chip *chip = pdev->bus->msi;
 	struct rcar_msi *msi = to_rcar_msi(chip);
 	struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
 	struct msi_msg msg;
@@ -645,10 +646,11 @@ static int rcar_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
 	return 0;
 }
 
-static void rcar_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
+static void rcar_msi_teardown_irq(unsigned int irq)
 {
-	struct rcar_msi *msi = to_rcar_msi(chip);
 	struct irq_data *d = irq_get_irq_data(irq);
+	struct msi_chip *chip = irq_get_chip_data(irq);
+	struct rcar_msi *msi = to_rcar_msi(chip);
 
 	rcar_msi_free(msi, d->hwirq);
 }
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index aae2fc8..51d7e62 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -37,7 +37,7 @@ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 	if (!chip || !chip->setup_irq)
 		return -EINVAL;
 
-	err = chip->setup_irq(chip, dev, desc);
+	err = chip->setup_irq(dev, desc);
 	if (err < 0)
 		return err;
 
@@ -53,7 +53,7 @@ void __weak arch_teardown_msi_irq(unsigned int irq)
 	if (!chip || !chip->teardown_irq)
 		return;
 
-	chip->teardown_irq(chip, irq);
+	chip->teardown_irq(irq);
 }
 
 int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 36c63cf..45ef8cb 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -68,9 +68,8 @@ struct msi_chip {
 	struct device_node *of_node;
 	struct list_head list;
 
-	int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
-			 struct msi_desc *desc);
-	void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
+	int (*setup_irq)(struct pci_dev *dev, struct msi_desc *desc);
+	void (*teardown_irq)(unsigned int irq);
 };
 
 #endif /* LINUX_MSI_H */
-- 
1.7.1