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

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>

diff --git a/drivers/dio/dio-driver.c b/drivers/dio/dio-driver.c
index ca8e69d2f64d632118c32e9c05c63a5ae660a71e..e4c48e329367d93617635e65a671ffb2816a47f7 100644 (file)
--- a/drivers/dio/dio-driver.c
+++ b/drivers/dio/dio-driver.c
@@ -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);
 }
 
 

diff --git a/drivers/net/hplance.c b/drivers/net/hplance.c
index d8410634bcafc078ad4da1f6979fe1577a842b81..68569346460528654a5491abb34ad83a6c64bca2 100644 (file)
--- a/drivers/net/hplance.c
+++ b/drivers/net/hplance.c
@@ -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)

diff --git a/drivers/serial/8250_hp300.c b/drivers/serial/8250_hp300.c
index 4315afe9c080a6beb1103643e6f3509a28f31cd2..53e81a44c1a3917fece986bef143e38401ff6f7e 100644 (file)
--- a/drivers/serial/8250_hp300.c
+++ b/drivers/serial/8250_hp300.c
@@ -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) {

diff --git a/drivers/video/hpfb.c b/drivers/video/hpfb.c
index bebdac59d231330c353940a009ba612807f4de37..abd920a663a04a2fbbfd8446c1183af83ebf7228 100644 (file)
--- a/drivers/video/hpfb.c
+++ b/drivers/video/hpfb.c
@@ -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);

diff --git a/include/linux/dio.h b/include/linux/dio.h
index fae9395fcf4f0e9baaef33c9f7fa84f0dd50a3f4..1e65ebc2a3dbb5496d8ca6e82d091e25f9160ccd 100644 (file)
--- a/include/linux/dio.h
+++ b/include/linux/dio.h
@@ -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 */