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

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

[Jisheng Zhang]

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

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

[Thierry Reding]

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On Tue, Jul 29, 2014 at 09:33:30AM +0800, Jisheng Zhang wrote:
> 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;

There seems to be an inconsistency regarding the data type of hwirq. The
irq_data structure uses unsigned long, but irqd_to_hwirq() function
returns irq_hw_number_t. Perhaps it would be best to use this instead:

	irq_hw_number_t hwirq = irqd_to_hwirq(d);

But I don't have a strong preference for either way, so with or without
that change:

Reviewed-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>

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

[Bjorn Helgaas]

On Tue, Jul 29, 2014 at 09:33:30AM +0800, Jisheng Zhang wrote:
> 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>

Applied to pci/host-tegra for v3.18, with the irqd_to_hwirq() change
Thierry suggested and his Reviewed-by and Ack, thanks!

> ---
>  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
>