[patch 05/39] genirq/msi: Remove filter from msi_free_descs_free_range()

Thomas Gleixner
2022-11-11T13:54:56Z

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>
---
drivers/base/platform-msi.c | 2 +-
include/linux/msi.h | 5 ++---
kernel/irq/msi.c | 19 ++++++++++---------
3 files changed, 13 insertions(+), 13 deletions(-)

--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -325,7 +325,7 @@ void platform_msi_device_domain_free(str

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);
}

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -247,8 +247,7 @@ static inline void pci_write_msi_msg(uns
#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 dev
*/
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);
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -120,7 +120,7 @@ static int msi_add_simple_msi_descs(stru
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_de
/**
* 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 dev
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_
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;