Merge tag 'irq-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner:
"A set of updates for the interrupt susbsystem:
- Prevent possible NULL pointer derefences in
irq_data_get_affinity_mask() and irq_domain_create_hierarchy()
- Take the per device MSI lock before invoking code which relies on
it being hold
- Make sure that MSI descriptors are unreferenced before freeing
them. This was overlooked when the platform MSI code was converted
to use core infrastructure and results in a fals positive warning
- Remove dead code in the MSI subsystem
- Clarify the documentation for pci_msix_free_irq()
- More kobj_type constification"
* tag 'irq-urgent-2023-03-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq/msi, platform-msi: Ensure that MSI descriptors are unreferenced
genirq/msi: Drop dead domain name assignment
irqdomain: Add missing NULL pointer check in irq_domain_create_hierarchy()
genirq/irqdesc: Make kobj_type structures constant
PCI/MSI: Clarify usage of pci_msix_free_irq()
genirq/msi: Take the per-device MSI lock before validating the control structure
genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask()
diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index 5883e76..f37ad34 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -324,6 +324,7 @@
struct platform_msi_priv_data *data = domain->host_data;
msi_lock_descs(data->dev);
+ msi_domain_depopulate_descs(data->dev, virq, nr_irqs);
irq_domain_free_irqs_common(domain, virq, nr_irqs);
msi_free_msi_descs_range(data->dev, virq, virq + nr_irqs - 1);
msi_unlock_descs(data->dev);
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
index b8009aa..be679aa 100644
--- a/drivers/pci/msi/api.c
+++ b/drivers/pci/msi/api.c
@@ -163,11 +163,11 @@
/**
* pci_msix_free_irq - Free an interrupt on a PCI/MSIX interrupt domain
- * which was allocated via pci_msix_alloc_irq_at()
*
* @dev: The PCI device to operate on
* @map: A struct msi_map describing the interrupt to free
- * as returned from the allocation function.
+ *
+ * Undo an interrupt vector allocation. Does not disable MSI-X.
*/
void pci_msix_free_irq(struct pci_dev *dev, struct msi_map map)
{
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 13c9b74..cdb14a1 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -635,6 +635,8 @@
int nvec, msi_alloc_info_t *args);
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
int virq, int nvec, msi_alloc_info_t *args);
+void msi_domain_depopulate_descs(struct device *dev, int virq, int nvec);
+
struct irq_domain *
__platform_msi_create_device_domain(struct device *dev,
unsigned int nvec,
diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c
index bbd945b..961d4af 100644
--- a/kernel/irq/ipi.c
+++ b/kernel/irq/ipi.c
@@ -188,9 +188,9 @@
static int ipi_send_verify(struct irq_chip *chip, struct irq_data *data,
const struct cpumask *dest, unsigned int cpu)
{
- const struct cpumask *ipimask = irq_data_get_affinity_mask(data);
+ const struct cpumask *ipimask;
- if (!chip || !ipimask)
+ if (!chip || !data)
return -EINVAL;
if (!chip->ipi_send_single && !chip->ipi_send_mask)
@@ -199,6 +199,10 @@
if (cpu >= nr_cpu_ids)
return -EINVAL;
+ ipimask = irq_data_get_affinity_mask(data);
+ if (!ipimask)
+ return -EINVAL;
+
if (dest) {
if (!cpumask_subset(dest, ipimask))
return -EINVAL;
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index fd09962..240e145 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -277,7 +277,7 @@
};
ATTRIBUTE_GROUPS(irq);
-static struct kobj_type irq_kobj_type = {
+static const struct kobj_type irq_kobj_type = {
.release = irq_kobj_release,
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = irq_groups,
@@ -335,7 +335,7 @@
#else /* !CONFIG_SYSFS */
-static struct kobj_type irq_kobj_type = {
+static const struct kobj_type irq_kobj_type = {
.release = irq_kobj_release,
};
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 7d4fc64..f34760a 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1147,7 +1147,8 @@
domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
if (domain) {
- domain->root = parent->root;
+ if (parent)
+ domain->root = parent->root;
domain->parent = parent;
domain->flags |= flags;
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index d0f0389..7a97bcb 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -830,11 +830,8 @@
domain = irq_domain_create_hierarchy(parent, flags | IRQ_DOMAIN_FLAG_MSI, 0,
fwnode, &msi_domain_ops, info);
- if (domain) {
- if (!domain->name && info->chip)
- domain->name = info->chip->name;
+ if (domain)
irq_domain_update_bus_token(domain, info->bus_token);
- }
return domain;
}
@@ -1084,10 +1081,13 @@
struct xarray *xa;
int ret, virq;
- if (!msi_ctrl_valid(dev, &ctrl))
- return -EINVAL;
-
msi_lock_descs(dev);
+
+ if (!msi_ctrl_valid(dev, &ctrl)) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
ret = msi_domain_add_simple_msi_descs(dev, &ctrl);
if (ret)
goto unlock;
@@ -1109,14 +1109,35 @@
return 0;
fail:
- for (--virq; virq >= virq_base; virq--)
+ for (--virq; virq >= virq_base; virq--) {
+ msi_domain_depopulate_descs(dev, virq, 1);
irq_domain_free_irqs_common(domain, virq, 1);
+ }
msi_domain_free_descs(dev, &ctrl);
unlock:
msi_unlock_descs(dev);
return ret;
}
+void msi_domain_depopulate_descs(struct device *dev, int virq_base, int nvec)
+{
+ struct msi_ctrl ctrl = {
+ .domid = MSI_DEFAULT_DOMAIN,
+ .first = virq_base,
+ .last = virq_base + nvec - 1,
+ };
+ struct msi_desc *desc;
+ struct xarray *xa;
+ unsigned long idx;
+
+ if (!msi_ctrl_valid(dev, &ctrl))
+ return;
+
+ xa = &dev->msi.data->__domains[ctrl.domid].store;
+ xa_for_each_range(xa, idx, desc, ctrl.first, ctrl.last)
+ desc->irq = 0;
+}
+
/*
* Carefully check whether the device can use reservation mode. If
* reservation mode is enabled then the early activation will assign a
