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drivers: Add generic helper to match any device

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Add a generic helper to match any/all devices. Using this
introduce new wrappers {bus/driver/class}_find_next_device().

Cc: Elie Morisse <syniurge@gmail.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Nehal Shah <nehal-bakulchandra.shah@amd.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Shyam Sundar S K <shyam-sundar.s-k@amd.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com> # PCI
Link: https://lore.kernel.org/r/20190723221838.12024-7-suzuki.poulose@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2019-07-23 23:18:37 +01:00 • committed by Greg Kroah-Hartman
parent 00500147cb
commit 6bf85ba9e5
6 changed files with 28 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/base/core.c
View file

@ -3379,3 +3379,9 @@ int device_match_acpi_dev(struct device *dev, const void *adev)
return ACPI_COMPANION(dev) == adev;
}
EXPORT_SYMBOL(device_match_acpi_dev);
int device_match_any(struct device *dev, const void *unused)
{
return 1;
}
EXPORT_SYMBOL_GPL(device_match_any);

8
drivers/i2c/busses/i2c-amd-mp2-pci.c
View file

@ -457,18 +457,12 @@ static struct pci_driver amd_mp2_pci_driver = {
};
module_pci_driver(amd_mp2_pci_driver);
static int amd_mp2_device_match(struct device *dev, const void *data)
{
return 1;
}
struct amd_mp2_dev *amd_mp2_find_device(void)
{
struct device *dev;
struct pci_dev *pci_dev;
dev = driver_find_device(&amd_mp2_pci_driver.driver, NULL, NULL,
amd_mp2_device_match);
dev = driver_find_next_device(&amd_mp2_pci_driver.driver, NULL);
if (!dev)
return NULL;

7
drivers/pci/probe.c
View file

@ -64,11 +64,6 @@ static struct resource *get_pci_domain_busn_res(int domain_nr)
return &r->res;
}
static int find_anything(struct device *dev, const void *data)
{
return 1;
}
/*
* Some device drivers need know if PCI is initiated.
* Basically, we think PCI is not initiated when there
@ -79,7 +74,7 @@ int no_pci_devices(void)
struct device *dev;
int no_devices;
dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
dev = bus_find_next_device(&pci_bus_type, NULL);
no_devices = (dev == NULL);
put_device(dev);
return no_devices;

8
drivers/s390/cio/ccwgroup.c
View file

@ -581,11 +581,6 @@ int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
}
EXPORT_SYMBOL(ccwgroup_driver_register);
static int __ccwgroup_match_all(struct device *dev, const void *data)
{
return 1;
}
/**
* ccwgroup_driver_unregister() - deregister a ccw group driver
* @cdriver: driver to be deregistered
@ -597,8 +592,7 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
struct device *dev;
/* We don't want ccwgroup devices to live longer than their driver. */
while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
__ccwgroup_match_all))) {
while ((dev = driver_find_next_device(&cdriver->driver, NULL))) {
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
ccwgroup_ungroup(gdev);

9
drivers/scsi/scsi_proc.c
View file

@ -372,15 +372,10 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
return err;
}
static int always_match(struct device *dev, const void *data)
{
return 1;
}
static inline struct device *next_scsi_device(struct device *start)
{
struct device *next = bus_find_device(&scsi_bus_type, start, NULL,
always_match);
struct device *next = bus_find_next_device(&scsi_bus_type, start);
put_device(start);
return next;
}

17
include/linux/device.h
View file

@ -169,6 +169,7 @@ int device_match_of_node(struct device *dev, const void *np);
int device_match_fwnode(struct device *dev, const void *fwnode);
int device_match_devt(struct device *dev, const void *pdevt);
int device_match_acpi_dev(struct device *dev, const void *adev);
int device_match_any(struct device *dev, const void *unused);
int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
int (*fn)(struct device *dev, void *data));
@ -225,6 +226,16 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
return bus_find_device(bus, NULL, &devt, device_match_devt);
}
/**
* bus_find_next_device - Find the next device after a given device in a
* given bus.
*/
static inline struct device *
bus_find_next_device(struct bus_type *bus,struct device *cur)
{
return bus_find_device(bus, cur, NULL, device_match_any);
}
#ifdef CONFIG_ACPI
struct acpi_device;
@ -465,6 +476,12 @@ static inline struct device *driver_find_device_by_devt(struct device_driver *dr
return driver_find_device(drv, NULL, &devt, device_match_devt);
}
static inline struct device *driver_find_next_device(struct device_driver *drv,
struct device *start)
{
return driver_find_device(drv, start, NULL, device_match_any);
}
#ifdef CONFIG_ACPI
/**
* driver_find_device_by_acpi_dev : device iterator for locating a particular