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Subject[RFC PATCH v4 09/13] genirq/msi: Add support for .msi_unprepare callback
Date
Add an optional callback .msi_unprepare to struct msi_domain_ops.
This is used to clear any effect that is done by .msi_prepare callback.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
---
include/linux/msi.h | 3 +++
kernel/irq/msi.c | 10 ++++++++++
2 files changed, 13 insertions(+)

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 474490826f8c..f35dd19f6c69 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -239,6 +239,8 @@ struct msi_domain_ops {
int (*msi_prepare)(struct irq_domain *domain,
struct device *dev, int nvec,
msi_alloc_info_t *arg);
+ void (*msi_unprepare)(struct irq_domain *domain, int nvec,
+ void *data);
void (*msi_finish)(msi_alloc_info_t *arg, int retval);
void (*set_desc)(msi_alloc_info_t *arg,
struct msi_desc *desc);
@@ -319,6 +321,7 @@ void platform_msi_domain_free_irqs(struct device *dev);
/* When an MSI domain is used as an intermediate domain */
int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
int nvec, msi_alloc_info_t *args);
+void msi_domain_unprepare_irqs(struct irq_domain *domain, int nvec, void *data);
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
int virq, int nvec, msi_alloc_info_t *args);
struct irq_domain *
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index eb7459324113..1a1738690519 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -312,6 +312,16 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
return ret;
}

+void msi_domain_unprepare_irqs(struct irq_domain *domain, int nvec,
+ void *data)
+{
+ struct msi_domain_info *info = domain->host_data;
+ struct msi_domain_ops *ops = info->ops;
+
+ if (ops->msi_unprepare)
+ ops->msi_unprepare(domain, nvec, data);
+}
+
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
int virq, int nvec, msi_alloc_info_t *arg)
{
--
2.19.2
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