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[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: 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>
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1 changed files with 23 additions and 9 deletions
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@ -1157,6 +1157,7 @@ static int __init pc_init(void)
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int crd;
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struct board_info *bd;
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unsigned char board_id = 0;
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int err = -ENOMEM;
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int pci_boards_found, pci_count;
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@ -1164,13 +1165,11 @@ static int __init pc_init(void)
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pc_driver = alloc_tty_driver(MAX_ALLOC);
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if (!pc_driver)
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return -ENOMEM;
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goto out1;
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pc_info = alloc_tty_driver(MAX_ALLOC);
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if (!pc_info) {
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put_tty_driver(pc_driver);
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return -ENOMEM;
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}
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if (!pc_info)
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goto out2;
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/* -----------------------------------------------------------------------
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If epca_setup has not been ran by LILO set num_cards to defaults; copy
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@ -1370,11 +1369,17 @@ static int __init pc_init(void)
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} /* End for each card */
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if (tty_register_driver(pc_driver))
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panic("Couldn't register Digi PC/ driver");
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err = tty_register_driver(pc_driver);
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if (err) {
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printk(KERN_ERR "Couldn't register Digi PC/ driver");
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goto out3;
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}
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if (tty_register_driver(pc_info))
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panic("Couldn't register Digi PC/ info ");
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err = tty_register_driver(pc_info);
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if (err) {
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printk(KERN_ERR "Couldn't register Digi PC/ info ");
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goto out4;
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}
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/* -------------------------------------------------------------------
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Start up the poller to check for events on all enabled boards
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@ -1385,6 +1390,15 @@ static int __init pc_init(void)
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mod_timer(&epca_timer, jiffies + HZ/25);
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return 0;
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out4:
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tty_unregister_driver(pc_driver);
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out3:
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put_tty_driver(pc_info);
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out2:
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put_tty_driver(pc_driver);
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out1:
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return err;
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} /* End pc_init */
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/* ------------------ Begin post_fep_init ---------------------- */
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