[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>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/serial/8250_hp300.c b/drivers/serial/8250_hp300.c
index 4315afe9c080..53e81a44c1a3 100644
--- 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) {