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Subject[PATCH] 2.6.6 synclinkmp.c
From
Date
Patch to drivers/char/synclinkmp.c against 2.6.6
to cleanup properly on errors during
driver initialization.

In particular, call pci_unregister_driver if
driver init fails. This is in response to a bug
report by Dave Jones.

Please apply.
--
Paul Fulghum
paulkf@microgate.com


--- linux-2.6.6/drivers/char/synclinkmp.c 2004-06-01 15:30:02.967249331 -0500
+++ linux-2.6.6-mg1/drivers/char/synclinkmp.c 2004-06-01 15:28:31.022403976 -0500
@@ -1,5 +1,5 @@
/*
- * $Id: synclinkmp.c,v 4.19 2004/03/08 15:29:23 paulkf Exp $
+ * $Id: synclinkmp.c,v 4.20 2004/06/01 20:27:46 paulkf Exp $
*
* Device driver for Microgate SyncLink Multiport
* high speed multiprotocol serial adapter.
@@ -494,7 +494,7 @@
MODULE_PARM(dosyncppp,"1-" __MODULE_STRING(MAX_DEVICES) "i");

static char *driver_name = "SyncLink MultiPort driver";
-static char *driver_version = "$Revision: 4.19 $";
+static char *driver_version = "$Revision: 4.20 $";

static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
static void synclinkmp_remove_one(struct pci_dev *dev);
@@ -3781,56 +3781,7 @@
.tiocmset = tiocmset,
};

-/* Driver initialization entry point.
- */
-
-static int __init synclinkmp_init(void)
-{
- if (break_on_load) {
- synclinkmp_get_text_ptr();
- BREAKPOINT();
- }
-
- printk("%s %s\n", driver_name, driver_version);
-
- synclinkmp_adapter_count = -1;
- pci_register_driver(&synclinkmp_pci_driver);
-
- if ( !synclinkmp_device_list ) {
- printk("%s(%d):No SyncLink devices found.\n",__FILE__,__LINE__);
- return -ENODEV;
- }
-
- serial_driver = alloc_tty_driver(synclinkmp_device_count);
- if (!serial_driver)
- return -ENOMEM;
-
- /* Initialize the tty_driver structure */
-
- serial_driver->owner = THIS_MODULE;
- serial_driver->driver_name = "synclinkmp";
- serial_driver->name = "ttySLM";
- serial_driver->major = ttymajor;
- serial_driver->minor_start = 64;
- serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
- serial_driver->subtype = SERIAL_TYPE_NORMAL;
- serial_driver->init_termios = tty_std_termios;
- serial_driver->init_termios.c_cflag =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- serial_driver->flags = TTY_DRIVER_REAL_RAW;
- tty_set_operations(serial_driver, &ops);
- if (tty_register_driver(serial_driver) < 0)
- printk("%s(%d):Couldn't register serial driver\n",
- __FILE__,__LINE__);
-
- printk("%s %s, tty major#%d\n",
- driver_name, driver_version,
- serial_driver->major);
-
- return 0;
-}
-
-static void __exit synclinkmp_exit(void)
+static void synclinkmp_cleanup(void)
{
unsigned long flags;
int rc;
@@ -3839,10 +3790,12 @@

printk("Unloading %s %s\n", driver_name, driver_version);

- if ((rc = tty_unregister_driver(serial_driver)))
- printk("%s(%d) failed to unregister tty driver err=%d\n",
- __FILE__,__LINE__,rc);
- put_tty_driver(serial_driver);
+ if (serial_driver) {
+ if ((rc = tty_unregister_driver(serial_driver)))
+ printk("%s(%d) failed to unregister tty driver err=%d\n",
+ __FILE__,__LINE__,rc);
+ put_tty_driver(serial_driver);
+ }

info = synclinkmp_device_list;
while(info) {
@@ -3882,6 +3835,73 @@
pci_unregister_driver(&synclinkmp_pci_driver);
}

+/* Driver initialization entry point.
+ */
+
+static int __init synclinkmp_init(void)
+{
+ int rc;
+
+ if (break_on_load) {
+ synclinkmp_get_text_ptr();
+ BREAKPOINT();
+ }
+
+ printk("%s %s\n", driver_name, driver_version);
+
+ synclinkmp_adapter_count = -1;
+ rc = pci_register_driver(&synclinkmp_pci_driver);
+
+ if (rc <= 0 || !synclinkmp_device_list) {
+ printk("%s(%d):No SyncLink devices found.\n",__FILE__,__LINE__);
+ rc = -ENODEV;
+ goto error;
+ }
+
+ serial_driver = alloc_tty_driver(synclinkmp_device_count);
+ if (!serial_driver) {
+ rc = -ENOMEM;
+ goto error;
+ }
+
+ /* Initialize the tty_driver structure */
+
+ serial_driver->owner = THIS_MODULE;
+ serial_driver->driver_name = "synclinkmp";
+ serial_driver->name = "ttySLM";
+ serial_driver->major = ttymajor;
+ serial_driver->minor_start = 64;
+ serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ serial_driver->subtype = SERIAL_TYPE_NORMAL;
+ serial_driver->init_termios = tty_std_termios;
+ serial_driver->init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver->flags = TTY_DRIVER_REAL_RAW;
+ tty_set_operations(serial_driver, &ops);
+ if ((rc = tty_register_driver(serial_driver)) < 0) {
+ printk("%s(%d):Couldn't register serial driver\n",
+ __FILE__,__LINE__);
+ put_tty_driver(serial_driver);
+ serial_driver = NULL;
+ goto error;
+ }
+
+ printk("%s %s, tty major#%d\n",
+ driver_name, driver_version,
+ serial_driver->major);
+
+ return 0;
+
+error:
+ synclinkmp_cleanup();
+ return rc;
+}
+
+static void __exit synclinkmp_exit(void)
+{
+ synclinkmp_cleanup();
+}
+
module_init(synclinkmp_init);
module_exit(synclinkmp_exit);



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