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serdev: Provide a bustype shutdown function

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To prepare serdev driver to migrate away from struct device_driver::shutdown
(and then eventually remove that callback) create a serdev driver shutdown
callback and migration code to keep the existing behaviour. Note this
introduces a warning for each driver at register time that isn't converted
yet to that callback.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/ab518883e3ed0976a19cb5b5b5faf42bd3a655b7.1765526117.git.u.kleine-koenig@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König
2025-12-12 09:09:06 +01:00
committed by Greg Kroah-Hartman
parent 42eeed6d9f
commit 6d71c62b13
2 changed files with 22 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/tty/serdev/core.c
View File

@@ -414,11 +414,21 @@ static void serdev_drv_remove(struct device *dev)
sdrv->remove(to_serdev_device(dev));
}
static void serdev_drv_shutdown(struct device *dev)
{
const struct serdev_device_driver *sdrv =
to_serdev_device_driver(dev->driver);
if (dev->driver && sdrv->shutdown)
sdrv->shutdown(to_serdev_device(dev));
}
static const struct bus_type serdev_bus_type = {
.name = "serial",
.match = serdev_device_match,
.probe = serdev_drv_probe,
.remove = serdev_drv_remove,
.shutdown = serdev_drv_shutdown,
};
/**
@@ -814,6 +824,14 @@ void serdev_controller_remove(struct serdev_controller *ctrl)
}
EXPORT_SYMBOL_GPL(serdev_controller_remove);
static void serdev_legacy_shutdown(struct serdev_device *serdev)
{
struct device *dev = &serdev->dev;
struct device_driver *driver = dev->driver;
driver->shutdown(dev);
}
/**
* __serdev_device_driver_register() - Register client driver with serdev core
* @sdrv: client driver to be associated with client-device.
@@ -830,6 +848,9 @@ int __serdev_device_driver_register(struct serdev_device_driver *sdrv, struct mo
/* force drivers to async probe so I/O is possible in probe */
sdrv->driver.probe_type = PROBE_PREFER_ASYNCHRONOUS;
if (!sdrv->shutdown && sdrv->driver.shutdown)
sdrv->shutdown = serdev_legacy_shutdown;
return driver_register(&sdrv->driver);
}
EXPORT_SYMBOL_GPL(__serdev_device_driver_register);

1
include/linux/serdev.h
View File

@@ -65,6 +65,7 @@ struct serdev_device_driver {
struct device_driver driver;
int (*probe)(struct serdev_device *);
void (*remove)(struct serdev_device *);
void (*shutdown)(struct serdev_device *);
};
static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d)