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Date: Tue, 10 Oct 2006 12:01:45 +0900 From: Akinobu Mita <akinobu.mita@...il.com> To: Randy Dunlap <rdunlap@...otime.net> Cc: linux-kernel@...r.kernel.org, akpm@...l.org, "Digi International, Inc" <Eng.Linux@...i.com> Subject: Re: [PATCH] epca: privent from panic on tty_register_driver() failure On Mon, Oct 09, 2006 at 08:45:45AM -0700, Randy Dunlap wrote: > > > > 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; > > and then out2: uses pc_info, if it's NULL. Is that OK? I made mistake. I swapped the order of these two put_tty_driver() in error handling wrongly. This is fixed version. Subject: epca: privent from panic on tty_register_driver() failure This patch make epca fail on initialization failure instead of panic. Cc: "Digi International, Inc" <Eng.Linux@...i.com> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com> drivers/char/epca.c | 32 +++++++++++++++++++++++--------- 1 file changed, 23 insertions(+), 9 deletions(-) Index: work-fault-inject/drivers/char/epca.c =================================================================== --- work-fault-inject.orig/drivers/char/epca.c 2006-10-09 22:16:24.000000000 +0900 +++ work-fault-inject/drivers/char/epca.c 2006-10-10 00:47:50.000000000 +0900 @@ -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 ---------------------- */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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