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[PATCH] epca: prevent panic on tty_register_driver() failure

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Make epca fail on initialization failure instead of panic.

Cc: "Digi International, Inc" <Eng.Linux@digi.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Acked-by: Scott Kilau <scottk@digi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Akinobu Mita 2006-10-17 00:10:28 -07:00 committed by Linus Torvalds
parent ea6f94dfe9
commit dabad0568a
1 changed files with 23 additions and 9 deletions
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32
drivers/char/epca.c
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@ -1157,6 +1157,7 @@ static int __init pc_init(void)
int crd;
struct board_info *bd;
unsigned char board_id = 0;
int err = -ENOMEM;
int pci_boards_found, pci_count;
@ -1164,13 +1165,11 @@ static int __init pc_init(void)
pc_driver = alloc_tty_driver(MAX_ALLOC);
if (!pc_driver)
return -ENOMEM;
goto out1;
pc_info = alloc_tty_driver(MAX_ALLOC);
if (!pc_info) {
put_tty_driver(pc_driver);
return -ENOMEM;
}
if (!pc_info)
goto out2;
/* -----------------------------------------------------------------------
If epca_setup has not been ran by LILO set num_cards to defaults; copy
@ -1370,11 +1369,17 @@ static int __init pc_init(void)
} /* End for each card */
if (tty_register_driver(pc_driver))
panic("Couldn't register Digi PC/ driver");
err = tty_register_driver(pc_driver);
if (err) {
printk(KERN_ERR "Couldn't register Digi PC/ driver");
goto out3;
}
if (tty_register_driver(pc_info))
panic("Couldn't register Digi PC/ info ");
err = tty_register_driver(pc_info);
if (err) {
printk(KERN_ERR "Couldn't register Digi PC/ info ");
goto out4;
}
/* -------------------------------------------------------------------
Start up the poller to check for events on all enabled boards
@ -1385,6 +1390,15 @@ static int __init pc_init(void)
mod_timer(&epca_timer, jiffies + HZ/25);
return 0;
out4:
tty_unregister_driver(pc_driver);
out3:
put_tty_driver(pc_info);
out2:
put_tty_driver(pc_driver);
out1:
return err;
} /* End pc_init */
/* ------------------ Begin post_fep_init ---------------------- */