[PATCH] amiga: fix driver_register() return handling, remove zorro_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.

zorro_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 zorro_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: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/net/a2065.c

@@ -829,7 +829,7 @@ static void __devexit a2065_remove_one(struct zorro_dev *z)
 
 static int __init a2065_init_module(void)
 {
-	return zorro_module_init(&a2065_driver);
+	return zorro_register_driver(&a2065_driver);
 }
 
 static void __exit a2065_cleanup_module(void)

drivers/net/ariadne.c

@@ -864,7 +864,7 @@ static void __devexit ariadne_remove_one(struct zorro_dev *z)
 
 static int __init ariadne_init_module(void)
 {
-    return zorro_module_init(&ariadne_driver);
+    return zorro_register_driver(&ariadne_driver);
 }
 
 static void __exit ariadne_cleanup_module(void)

drivers/net/hydra.c

@@ -242,7 +242,7 @@ static void __devexit hydra_remove_one(struct zorro_dev *z)
 
 static int __init hydra_init_module(void)
 {
-    return zorro_module_init(&hydra_driver);
+    return zorro_register_driver(&hydra_driver);
 }
 
 static void __exit hydra_cleanup_module(void)

drivers/net/zorro8390.c

@@ -426,7 +426,7 @@ static void __devexit zorro8390_remove_one(struct zorro_dev *z)
 
 static int __init zorro8390_init_module(void)
 {
-    return zorro_module_init(&zorro8390_driver);
+    return zorro_register_driver(&zorro8390_driver);
 }
 
 static void __exit zorro8390_cleanup_module(void)

drivers/video/cirrusfb.c

@@ -2622,7 +2622,7 @@ static int __init cirrusfb_init(void)
 #endif
 
 #ifdef CONFIG_ZORRO
-	error |= zorro_module_init(&cirrusfb_zorro_driver);
+	error |= zorro_register_driver(&cirrusfb_zorro_driver);
 #endif
 #ifdef CONFIG_PCI
 	error |= pci_register_driver(&cirrusfb_pci_driver);

drivers/zorro/zorro-driver.c

@@ -65,22 +65,17 @@ static int zorro_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 Zorro 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 zorro_register_driver(struct zorro_driver *drv)
 {
-	int count = 0;
-
 	/* initialize common driver fields */
 	drv->driver.name = drv->name;
 	drv->driver.bus = &zorro_bus_type;
 
 	/* register with core */
-	count = driver_register(&drv->driver);
-	return count ? count : 1;
+	return driver_register(&drv->driver);
 }
 
 

include/linux/zorro.h

@@ -271,39 +271,6 @@ static inline void zorro_set_drvdata (struct zorro_dev *z, void *data)
 }
 
 
-/*
- * A helper function which helps ensure correct zorro_driver
- * setup and cleanup for commonly-encountered hotplug/modular cases
- *
- * This MUST stay in a header, as it checks for -DMODULE
- */
-static inline int zorro_module_init(struct zorro_driver *drv)
-{
-	int rc = zorro_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 Zorro driver instance
-	 * and return some sort of error */
-	zorro_unregister_driver(drv);
-
-	return rc;
-}
-
-
     /*
      *  Bitmask indicating portions of available Zorro II RAM that are unused
      *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB