Commit dabad056 authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds

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

Make epca fail on initialization failure instead of panic.

Cc: "Digi International, Inc" <Eng.Linux@digi.com>
Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Acked-by: default avatarAlan Cox <alan@redhat.com>
Acked-by: default avatarScott Kilau <scottk@digi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ea6f94df
...@@ -1157,6 +1157,7 @@ static int __init pc_init(void) ...@@ -1157,6 +1157,7 @@ static int __init pc_init(void)
int crd; int crd;
struct board_info *bd; struct board_info *bd;
unsigned char board_id = 0; unsigned char board_id = 0;
int err = -ENOMEM;
int pci_boards_found, pci_count; int pci_boards_found, pci_count;
...@@ -1164,13 +1165,11 @@ static int __init pc_init(void) ...@@ -1164,13 +1165,11 @@ static int __init pc_init(void)
pc_driver = alloc_tty_driver(MAX_ALLOC); pc_driver = alloc_tty_driver(MAX_ALLOC);
if (!pc_driver) if (!pc_driver)
return -ENOMEM; goto out1;
pc_info = alloc_tty_driver(MAX_ALLOC); pc_info = alloc_tty_driver(MAX_ALLOC);
if (!pc_info) { if (!pc_info)
put_tty_driver(pc_driver); goto out2;
return -ENOMEM;
}
/* ----------------------------------------------------------------------- /* -----------------------------------------------------------------------
If epca_setup has not been ran by LILO set num_cards to defaults; copy 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) ...@@ -1370,11 +1369,17 @@ static int __init pc_init(void)
} /* End for each card */ } /* End for each card */
if (tty_register_driver(pc_driver)) err = tty_register_driver(pc_driver);
panic("Couldn't register Digi PC/ driver"); if (err) {
printk(KERN_ERR "Couldn't register Digi PC/ driver");
goto out3;
}
if (tty_register_driver(pc_info)) err = tty_register_driver(pc_info);
panic("Couldn't register Digi 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 Start up the poller to check for events on all enabled boards
...@@ -1385,6 +1390,15 @@ static int __init pc_init(void) ...@@ -1385,6 +1390,15 @@ static int __init pc_init(void)
mod_timer(&epca_timer, jiffies + HZ/25); mod_timer(&epca_timer, jiffies + HZ/25);
return 0; 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 */ } /* End pc_init */
/* ------------------ Begin post_fep_init ---------------------- */ /* ------------------ Begin post_fep_init ---------------------- */
......
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