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Subject[PATCH 8/11] Char: cyclades, cy_init error handling
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cyclades, cy_init error handling

- do not panic if tty_register_driver fails
- handle fail paths properly

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>

---
commit 8c76c370ee1c1efa31f64807162c15922fae1e3a
tree 19fe12eba568aece1d0b406a4d735f393f2cd3dd
parent b1b13ea51dcaef72c5298a04d233b92206adf978
author Jiri Slaby <jirislaby@gmail.com> Mon, 02 Apr 2007 15:47:49 +0200
committer Jiri Slaby <jirislaby@gmail.com> Tue, 10 Apr 2007 10:48:06 +0200
drivers/char/cyclades.c | 23 +++++++++++++++++++----
1 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index 1baf7d7..22f8ec4 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -5460,10 +5460,11 @@ static const struct tty_operations cy_ops = {
static int __init cy_init(void)
{
unsigned int i, nboards;
+ int retval = -ENOMEM;

cy_serial_driver = alloc_tty_driver(NR_PORTS);
if (!cy_serial_driver)
- return -ENOMEM;
+ goto err;
show_version();

/* Initialize the tty_driver structure */
@@ -5481,8 +5482,11 @@ static int __init cy_init(void)
cy_serial_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(cy_serial_driver, &cy_ops);

- if (tty_register_driver(cy_serial_driver))
- panic("Couldn't register Cyclades serial driver\n");
+ retval = tty_register_driver(cy_serial_driver);
+ if (retval) {
+ printk(KERN_ERR "Couldn't register Cyclades serial driver\n");
+ goto err_frtty;
+ }

for (i = 0; i < NR_CARDS; i++) {
/* base_addr=0 indicates board not found */
@@ -5508,7 +5512,18 @@ static int __init cy_init(void)
/* look for pci boards */
nboards += cy_detect_pci();

- return nboards ? 0 : -ENODEV;
+ if (nboards == 0) {
+ retval = -ENODEV;
+ goto err_unr;
+ }
+
+ return 0;
+err_unr:
+ tty_unregister_driver(cy_serial_driver);
+err_frtty:
+ put_tty_driver(cy_serial_driver);
+err:
+ return retval;
} /* cy_init */

static void __exit cy_cleanup_module(void)
-
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