[tip: irq/core] genirq/msi: Provide msi_domain_ops:: Post_free()

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     f6d3486a3d2f3c67d732641834eec872fcc66472
Gitweb:        https://git.kernel.org/tip/f6d3486a3d2f3c67d732641834eec872fcc66472
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Fri, 11 Nov 2022 14:54:27 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Thu, 17 Nov 2022 15:15:19 +01:00

genirq/msi: Provide msi_domain_ops:: Post_free()

To prepare for removing the exposure of __msi_domain_free_irqs() provide a
post_free() callback in the MSI domain ops which can be used to solve
the problem of the only user of __msi_domain_free_irqs() in arch/powerpc.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221111122014.063153448@xxxxxxxxxxxxx

---
 include/linux/msi.h | 4 ++++
 kernel/irq/msi.c    | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 9b552ee..7f6aba9 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -315,6 +315,8 @@ struct msi_domain_info;
  *			function.
  * @domain_free_irqs:	Optional function to override the default free
  *			function.
+ * @msi_post_free:	Optional function which is invoked after freeing
+ *			all interrupts.
  *
  * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
  * irqdomain.
@@ -359,6 +361,8 @@ struct msi_domain_ops {
 					     struct device *dev, int nvec);
 	void		(*domain_free_irqs)(struct irq_domain *domain,
 					    struct device *dev);
+	void		(*msi_post_free)(struct irq_domain *domain,
+					 struct device *dev);
 };
 
 /**
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 3ccc7f6..c71c37d 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -1026,6 +1026,8 @@ void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device 
 	lockdep_assert_held(&dev->msi.data->mutex);
 
 	ops->domain_free_irqs(domain, dev);
+	if (ops->msi_post_free)
+		ops->msi_post_free(domain, dev);
 	msi_domain_free_msi_descs(info, dev);
 }