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drivers/base: Introduce device_match_t for device finding APIs

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There are several drivers/base APIs for finding a specific device, and
they currently use the following good type for the @match parameter:
int (*match)(struct device *dev, const void *data)

Since these operations do not modify the caller-provided @*data, this
type is worthy of a dedicated typedef:
typedef int (*device_match_t)(struct device *dev, const void *data)

Advantages of using device_match_t:
 - Shorter API declarations and definitions
 - Prevent further APIs from using a bad type for @match

So introduce device_match_t and apply it to the existing
(bus|class|driver|auxiliary)_find_device() APIs.

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20240813-dev_match_api-v3-1-6c6878a99b9f@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zijun Hu
2024-08-13 22:19:32 +08:00
committed by Greg Kroah-Hartman
parent f0e5311aa8
commit b45ed06f46
8 changed files with 11 additions and 10 deletions
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6
include/linux/device/bus.h
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@@ -126,6 +126,9 @@ struct bus_attribute {
int __must_check bus_create_file(const struct bus_type *bus, struct bus_attribute *attr);
void bus_remove_file(const struct bus_type *bus, struct bus_attribute *attr);
/* Matching function type for drivers/base APIs to find a specific device */
typedef int (*device_match_t)(struct device *dev, const void *data);
/* Generic device matching functions that all busses can use to match with */
int device_match_name(struct device *dev, const void *name);
int device_match_of_node(struct device *dev, const void *np);
@@ -139,8 +142,7 @@ int device_match_any(struct device *dev, const void *unused);
int bus_for_each_dev(const struct bus_type *bus, struct device *start, void *data,
int (*fn)(struct device *dev, void *data));
struct device *bus_find_device(const struct bus_type *bus, struct device *start,
const void *data,
int (*match)(struct device *dev, const void *data));
const void *data, device_match_t match);
/**
* bus_find_device_by_name - device iterator for locating a particular device
* of a specific name.