drivers: Add generic helper to match any device

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>

5 files changed, 11 insertions, 27 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 57d71bc2c559..e22e29b3dc97 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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);
diff --git a/drivers/i2c/busses/i2c-amd-mp2-pci.c b/drivers/i2c/busses/i2c-amd-mp2-pci.c
index c7fe3b44a860..5e4800d72e00 100644
--- a/drivers/i2c/busses/i2c-amd-mp2-pci.c
+++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
@@ -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;
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index a3c7338fad86..dbeeb385fb9f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -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;
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index d843e362c167..0005ec9285aa 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -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);
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
index c074631086a4..5b313226f11c 100644
--- a/drivers/scsi/scsi_proc.c
+++ b/drivers/scsi/scsi_proc.c
@@ -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;
 }