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[PATCH] hp300: fix driver_register() return handling, remove dio_module_init()

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Remove the assumption that driver_register() returns the number of devices
bound to the driver.  In fact, it returns zero for success or a negative
error value.

dio_module_init() used the device count to automatically unregister and
unload drivers that found no devices.  That might have worked at one time,
but has been broken for some time because dio_register_driver() returned
either a negative error or a positive count (never zero).  So it could only
unregister on failure, when it's not needed anyway.

This functionality could be resurrected in individual drivers by counting
devices in their .probe() methods.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Philip Blundell <philb@gnu.org>
Cc: Jochen Friedrich <jochen@scram.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bjorn Helgaas 2006-03-25 03:07:17 -08:00 committed by Linus Torvalds
parent 5930860296
commit e51c01b084
5 changed files with 11 additions and 46 deletions
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9
drivers/dio/dio-driver.c
View File

@ -71,22 +71,17 @@ static int dio_device_probe(struct device *dev)
* @drv: the driver structure to register
*
* Adds the driver structure to the list of registered drivers
* Returns the number of DIO devices which were claimed by the driver
* during registration. The driver remains registered even if the
* return value is zero.
* Returns zero or a negative error value.
*/
int dio_register_driver(struct dio_driver *drv)
{
int count = 0;
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &dio_bus_type;
/* register with core */
count = driver_register(&drv->driver);
return count ? count : 1;
return driver_register(&drv->driver);
}

2
drivers/net/hplance.c
View File

@ -217,7 +217,7 @@ static int hplance_close(struct net_device *dev)
int __init hplance_init_module(void)
{
return dio_module_init(&hplance_driver);
return dio_register_driver(&hplance_driver);
}
void __exit hplance_cleanup_module(void)

10
drivers/serial/8250_hp300.c
View File

@ -55,6 +55,8 @@ static struct dio_driver hpdca_driver = {
#endif
static unsigned int num_ports;
extern int hp300_uart_scode;
/* Offset to UART registers from base of DCA */
@ -199,6 +201,8 @@ static int __devinit hpdca_init_one(struct dio_dev *d,
out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
udelay(100);
num_ports++;
return 0;
}
#endif
@ -206,7 +210,6 @@ static int __devinit hpdca_init_one(struct dio_dev *d,
static int __init hp300_8250_init(void)
{
static int called = 0;
int num_ports;
#ifdef CONFIG_HPAPCI
int line;
unsigned long base;
@ -221,11 +224,8 @@ static int __init hp300_8250_init(void)
if (!MACH_IS_HP300)
return -ENODEV;
num_ports = 0;
#ifdef CONFIG_HPDCA
if (dio_module_init(&hpdca_driver) == 0)
num_ports++;
dio_register_driver(&hpdca_driver);
#endif
#ifdef CONFIG_HPAPCI
if (hp300_model < HP_400) {

4
drivers/video/hpfb.c
View File

@ -386,7 +386,9 @@ int __init hpfb_init(void)
if (fb_get_options("hpfb", NULL))
return -ENODEV;
dio_module_init(&hpfb_driver);
err = dio_register_driver(&hpfb_driver);
if (err)
return err;
fs = get_fs();
set_fs(KERNEL_DS);

32
include/linux/dio.h
View File

@ -276,37 +276,5 @@ static inline void dio_set_drvdata (struct dio_dev *d, void *data)
dev_set_drvdata(&d->dev, data);
}
/*
* A helper function which helps ensure correct dio_driver
* setup and cleanup for commonly-encountered hotplug/modular cases
*
* This MUST stay in a header, as it checks for -DMODULE
*/
static inline int dio_module_init(struct dio_driver *drv)
{
int rc = dio_register_driver(drv);
if (rc > 0)
return 0;
/* iff CONFIG_HOTPLUG and built into kernel, we should
* leave the driver around for future hotplug events.
* For the module case, a hotplug daemon of some sort
* should load a module in response to an insert event. */
#if defined(CONFIG_HOTPLUG) && !defined(MODULE)
if (rc == 0)
return 0;
#else
if (rc == 0)
rc = -ENODEV;
#endif
/* if we get here, we need to clean up DIO driver instance
* and return some sort of error */
dio_unregister_driver(drv);
return rc;
}
#endif /* __KERNEL__ */
#endif /* ndef _LINUX_DIO_H */