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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-03 16:00:15 -0700 |
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committer | Live-CD User <linux@linux.site> | 2009-09-19 13:13:10 -0700 |
commit | f0de0e8d3565ee7feba6228d99763d4cea2087a6 (patch) | |
tree | 2fd63db33a1f1e472325a8f4efd9f9b1b87729b0 /drivers/char | |
parent | 7a4b23104bd2624d16681158a9b338c502c103a0 (diff) | |
download | kernel_samsung_smdk4412-f0de0e8d3565ee7feba6228d99763d4cea2087a6.zip kernel_samsung_smdk4412-f0de0e8d3565ee7feba6228d99763d4cea2087a6.tar.gz kernel_samsung_smdk4412-f0de0e8d3565ee7feba6228d99763d4cea2087a6.tar.bz2 |
tty-ldisc: make /proc/tty/ldiscs use ldisc_ops instead of ldiscs
The /proc/tty/ldiscs file is totally and utterly un-interested in the
"struct tty_ldisc" structures, and only cares about the underlying ldisc
operations.
So don't make it create a dummy 'struct ldisc' only to get a pointer to
the operations, and then destroy it. Instead, we split up the function
'tty_ldisc_try_get()', and create a 'get_ldops()' helper that just looks
up the ldisc operations based on the ldisc number.
That makes the code simpler to read (smaller and more well-defined
helper functions), and allows the /proc functions to avoid creating that
useless dummy only to immediately free it again.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@mail.by>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/char')
-rw-r--r-- | drivers/char/tty_ldisc.c | 65 |
1 files changed, 39 insertions, 26 deletions
diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c index e48af9f..cbfacc0 100644 --- a/drivers/char/tty_ldisc.c +++ b/drivers/char/tty_ldisc.c @@ -145,6 +145,34 @@ int tty_unregister_ldisc(int disc) } EXPORT_SYMBOL(tty_unregister_ldisc); +static struct tty_ldisc_ops *get_ldops(int disc) +{ + unsigned long flags; + struct tty_ldisc_ops *ldops, *ret; + + spin_lock_irqsave(&tty_ldisc_lock, flags); + ret = ERR_PTR(-EINVAL); + ldops = tty_ldiscs[disc]; + if (ldops) { + ret = ERR_PTR(-EAGAIN); + if (try_module_get(ldops->owner)) { + ldops->refcount++; + ret = ldops; + } + } + spin_unlock_irqrestore(&tty_ldisc_lock, flags); + return ret; +} + +static void put_ldops(struct tty_ldisc_ops *ldops) +{ + unsigned long flags; + + spin_lock_irqsave(&tty_ldisc_lock, flags); + ldops->refcount--; + module_put(ldops->owner); + spin_unlock_irqrestore(&tty_ldisc_lock, flags); +} /** * tty_ldisc_try_get - try and reference an ldisc @@ -156,36 +184,21 @@ EXPORT_SYMBOL(tty_unregister_ldisc); static struct tty_ldisc *tty_ldisc_try_get(int disc) { - unsigned long flags; struct tty_ldisc *ld; struct tty_ldisc_ops *ldops; - int err = -EINVAL; ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL); if (ld == NULL) return ERR_PTR(-ENOMEM); - spin_lock_irqsave(&tty_ldisc_lock, flags); - ld->ops = NULL; - ldops = tty_ldiscs[disc]; - /* Check the entry is defined */ - if (ldops) { - /* If the module is being unloaded we can't use it */ - if (!try_module_get(ldops->owner)) - err = -EAGAIN; - else { - /* lock it */ - ldops->refcount++; - ld->ops = ldops; - atomic_set(&ld->users, 1); - err = 0; - } - } - spin_unlock_irqrestore(&tty_ldisc_lock, flags); - if (err) { + ldops = get_ldops(disc); + if (IS_ERR(ldops)) { kfree(ld); - return ERR_PTR(err); + return ERR_CAST(ldops); } + + ld->ops = ldops; + atomic_set(&ld->users, 1); return ld; } @@ -234,13 +247,13 @@ static void tty_ldiscs_seq_stop(struct seq_file *m, void *v) static int tty_ldiscs_seq_show(struct seq_file *m, void *v) { int i = *(loff_t *)v; - struct tty_ldisc *ld; + struct tty_ldisc_ops *ldops; - ld = tty_ldisc_try_get(i); - if (IS_ERR(ld)) + ldops = get_ldops(i); + if (IS_ERR(ldops)) return 0; - seq_printf(m, "%-10s %2d\n", ld->ops->name ? ld->ops->name : "???", i); - put_ldisc(ld); + seq_printf(m, "%-10s %2d\n", ldops->name ? ldops->name : "???", i); + put_ldops(ldops); return 0; } |