[PATCH v3] PCI: tegra: add missing cleanup in error path and teardown_irq

[Jisheng Zhang <jszhang@marvell.com>]

We should call tegra_msi_free() to free the MSI bit if
irq_create_mapping() fails. And we need to dispose the IRQ mapping
during IRQ teardown.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/pci/host/pci-tegra.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 083cf37..4ccc418 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -1203,8 +1203,10 @@ static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
 		return hwirq;
 
 	irq = irq_create_mapping(msi->domain, hwirq);
-	if (!irq)
+	if (!irq) {
+		tegra_msi_free(msi, hwirq);
 		return -EINVAL;
+	}
 
 	irq_set_msi_desc(irq, desc);
 
@@ -1222,8 +1224,10 @@ static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq)
 {
 	struct tegra_msi *msi = to_tegra_msi(chip);
 	struct irq_data *d = irq_get_irq_data(irq);
+	unsigned long hwirq = d->hwirq;
 
-	tegra_msi_free(msi, d->hwirq);
+	irq_dispose_mapping(irq);
+	tegra_msi_free(msi, hwirq);
 }
 
 static struct irq_chip tegra_msi_irq_chip = {
-- 
2.0.1