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iommu: make the pointer to struct bus_type constant

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A number of iommu functions take a struct bus_type * and never modify
the data passed in, so make them all const * as that is what the driver
core is expecting to have passed into as well.

This is a step toward making all struct bus_type pointers constant in
the kernel.

Cc: Will Deacon <will@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: iommu@lists.linux.dev
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20230313182918.1312597-34-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2023-03-13 19:29:16 +01:00
parent a3ea9fbc82
commit b18d0a0f92
2 changed files with 12 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
drivers/iommu/iommu.c
View file

@ -89,7 +89,7 @@ static int iommu_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data);
static int iommu_alloc_default_domain(struct iommu_group *group,
struct device *dev);
static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
unsigned type);
static int __iommu_attach_device(struct iommu_domain *domain,
struct device *dev);
@ -1631,7 +1631,7 @@ static int iommu_get_def_domain_type(struct device *dev)
return 0;
}
static int iommu_group_alloc_default_domain(struct bus_type *bus,
static int iommu_group_alloc_default_domain(const struct bus_type *bus,
struct iommu_group *group,
unsigned int type)
{
@ -1777,7 +1777,7 @@ static int probe_get_default_domain_type(struct device *dev, void *data)
return 0;
}
static void probe_alloc_default_domain(struct bus_type *bus,
static void probe_alloc_default_domain(const struct bus_type *bus,
struct iommu_group *group)
{
struct __group_domain_type gtype;
@ -1832,7 +1832,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group)
iommu_do_create_direct_mappings);
}
int bus_iommu_probe(struct bus_type *bus)
int bus_iommu_probe(const struct bus_type *bus)
{
struct iommu_group *group, *next;
LIST_HEAD(group_list);
@ -1876,7 +1876,7 @@ int bus_iommu_probe(struct bus_type *bus)
return ret;
}
bool iommu_present(struct bus_type *bus)
bool iommu_present(const struct bus_type *bus)
{
return bus->iommu_ops != NULL;
}
@ -1951,7 +1951,7 @@ void iommu_set_fault_handler(struct iommu_domain *domain,
}
EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
static struct iommu_domain *__iommu_domain_alloc(const struct bus_type *bus,
unsigned type)
{
struct iommu_domain *domain;
@ -1976,7 +1976,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
return domain;
}
struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
{
return __iommu_domain_alloc(bus, IOMMU_DOMAIN_UNMANAGED);
}

10
include/linux/iommu.h
View file

@ -455,11 +455,11 @@ static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
return dev->iommu->iommu_dev->ops;
}
extern int bus_iommu_probe(struct bus_type *bus);
extern bool iommu_present(struct bus_type *bus);
extern int bus_iommu_probe(const struct bus_type *bus);
extern bool iommu_present(const struct bus_type *bus);
extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
extern struct iommu_group *iommu_group_get_by_id(int id);
extern void iommu_domain_free(struct iommu_domain *domain);
extern int iommu_attach_device(struct iommu_domain *domain,
@ -732,7 +732,7 @@ struct iommu_device {};
struct iommu_fault_param {};
struct iommu_iotlb_gather {};
static inline bool iommu_present(struct bus_type *bus)
static inline bool iommu_present(const struct bus_type *bus)
{
return false;
}
@ -742,7 +742,7 @@ static inline bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
return false;
}
static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
static inline struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
{
return NULL;
}