genirq/msi: Remove filter from msi_free_descs_free_range()

When a range of descriptors is freed then all of them are not associated to
a linux interrupt. Remove the filter and add a warning to the free function.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20221111122013.888850936@linutronix.de

drivers/base/platform-msi.c

@@ -325,7 +325,7 @@ void platform_msi_device_domain_free(struct irq_domain *domain, unsigned int vir
 
 	msi_lock_descs(data->dev);
 	irq_domain_free_irqs_common(domain, virq, nr_irqs);
-	msi_free_msi_descs_range(data->dev, MSI_DESC_ALL, virq, virq + nr_irqs - 1);
+	msi_free_msi_descs_range(data->dev, virq, virq + nr_irqs - 1);
 	msi_unlock_descs(data->dev);
 }
 

include/linux/msi.h

@@ -247,8 +247,7 @@ static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
 #endif /* CONFIG_PCI_MSI */
 
 int msi_add_msi_desc(struct device *dev, struct msi_desc *init_desc);
-void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
-			      unsigned int first_index, unsigned int last_index);
+void msi_free_msi_descs_range(struct device *dev, unsigned int first_index, unsigned int last_index);
 
 /**
  * msi_free_msi_descs - Free MSI descriptors of a device
@@ -256,7 +255,7 @@ void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
  */
 static inline void msi_free_msi_descs(struct device *dev)
 {
-	msi_free_msi_descs_range(dev, MSI_DESC_ALL, 0, MSI_MAX_INDEX);
+	msi_free_msi_descs_range(dev, 0, MSI_MAX_INDEX);
 }
 
 void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);

kernel/irq/msi.c

@@ -120,7 +120,7 @@ static int msi_add_simple_msi_descs(struct device *dev, unsigned int index, unsi
 fail_mem:
 	ret = -ENOMEM;
 fail:
-	msi_free_msi_descs_range(dev, MSI_DESC_ALL, index, last);
+	msi_free_msi_descs_range(dev, index, last);
 	return ret;
 }
 
@@ -141,12 +141,11 @@ static bool msi_desc_match(struct msi_desc *desc, enum msi_desc_filter filter)
 /**
  * msi_free_msi_descs_range - Free MSI descriptors of a device
  * @dev:		Device to free the descriptors
- * @filter:		Descriptor state filter
  * @first_index:	Index to start freeing from
  * @last_index:		Last index to be freed
  */
-void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
-			      unsigned int first_index, unsigned int last_index)
+void msi_free_msi_descs_range(struct device *dev, unsigned int first_index,
+			      unsigned int last_index)
 {
 	struct xarray *xa = &dev->msi.data->__store;
 	struct msi_desc *desc;
@@ -155,10 +154,12 @@ void msi_free_msi_descs_range(struct device *dev, enum msi_desc_filter filter,
 	lockdep_assert_held(&dev->msi.data->mutex);
 
 	xa_for_each_range(xa, idx, desc, first_index, last_index) {
-		if (msi_desc_match(desc, filter)) {
-			xa_erase(xa, idx);
-			msi_free_desc(desc);
-		}
+		xa_erase(xa, idx);
+
+		/* Leak the descriptor when it is still referenced */
+		if (WARN_ON_ONCE(msi_desc_match(desc, MSI_DESC_ASSOCIATED)))
+			continue;
+		msi_free_desc(desc);
 	}
 }
 
@@ -739,7 +740,7 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
 fail:
 	for (--virq; virq >= virq_base; virq--)
 		irq_domain_free_irqs_common(domain, virq, 1);
-	msi_free_msi_descs_range(dev, MSI_DESC_ALL, virq_base, virq_base + nvec - 1);
+	msi_free_msi_descs_range(dev, virq_base, virq_base + nvec - 1);
 unlock:
 	msi_unlock_descs(dev);
 	return ret;