diff options
author | Alan Cox <alan@redhat.com> | 2008-10-13 09:42:00 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-13 16:51:42 (GMT) |
commit | 99f1fe189daf8e99a847e420567e49dd7ee2aae7 (patch) | |
tree | 09db410aa2b32e74086593eb771c75efe553a585 /drivers/char/tty_io.c | |
parent | 23499705753ab8b4c6b0b64e6c424a370bd900a1 (diff) | |
download | linux-fsl-qoriq-99f1fe189daf8e99a847e420567e49dd7ee2aae7.tar.xz |
tty: Clean up the tty_init_dev changes further
Fix up the naming, style and extract some bits of code into the driver
specific code
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_io.c')
-rw-r--r-- | drivers/char/tty_io.c | 64 |
1 files changed, 24 insertions, 40 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index a540849..ac41af8 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -1204,53 +1204,38 @@ static void tty_line_name(struct tty_driver *driver, int index, char *p) sprintf(p, "%s%d", driver->name, index + driver->name_base); } -/* - * find_tty() - find an existing tty, if any - * @driver: the driver for the tty - * @idx: the minor number +/** + * tty_driver_lookup_tty() - find an existing tty, if any + * @driver: the driver for the tty + * @idx: the minor number * - * Return the tty, if found or ERR_PTR() otherwise. + * Return the tty, if found or ERR_PTR() otherwise. * - * Locking: tty_mutex must be held. If tty is found, the mutex must - * be held until the 'fast-open' is also done. + * Locking: tty_mutex must be held. If tty is found, the mutex must + * be held until the 'fast-open' is also done. Will change once we + * have refcounting in the driver and per driver locking */ -struct tty_struct *find_tty(struct tty_driver *driver, int idx) +struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver, int idx) { struct tty_struct *tty; - /* check whether we're reopening an existing tty */ - if (driver->flags & TTY_DRIVER_DEVPTS_MEM) { - tty = devpts_get_tty(idx); - /* - * If we don't have a tty here on a slave open, it's because - * the master already started the close process and there's - * no relation between devpts file and tty anymore. - */ - if (!tty && driver->subtype == PTY_TYPE_SLAVE) - return ERR_PTR(-EIO); + if (driver->ops->lookup) + return driver->ops->lookup(driver, idx); - /* - * tty is safe on because we are called with tty_mutex held - * and release_dev() won't change tty->count or tty->flags - * without grabbing tty_mutex. - */ - if (tty && driver->subtype == PTY_TYPE_MASTER) - tty = tty->link; - } else tty = driver->ttys[idx]; return tty; } -/* - * fast_tty_open() - fast re-open of an open tty - * @tty - the tty to open +/** + * tty_reopen() - fast re-open of an open tty + * @tty - the tty to open * - * Return 0 on success, -errno on error. + * Return 0 on success, -errno on error. * - * Locking: tty_mutex must be held from the time the tty was found - * till this open completes. + * Locking: tty_mutex must be held from the time the tty was found + * till this open completes. */ -static int fast_tty_open(struct tty_struct *tty) +static int tty_reopen(struct tty_struct *tty) { struct tty_driver *driver = tty->driver; @@ -1271,9 +1256,7 @@ static int fast_tty_open(struct tty_struct *tty) tty->count++; tty->driver = driver; /* N.B. why do this every time?? */ - /* FIXME */ - if (!test_bit(TTY_LDISC, &tty->flags)) - printk(KERN_ERR "fast_tty_open: no ldisc\n"); + WARN_ON(!test_bit(TTY_LDISC, &tty->flags)); return 0; } @@ -1312,14 +1295,14 @@ int tty_init_dev(struct tty_driver *driver, int idx, int retval = 0; /* check whether we're reopening an existing tty */ - tty = find_tty(driver, idx); + tty = tty_driver_lookup_tty(driver, idx); if (IS_ERR(tty)) { retval = PTR_ERR(tty); goto end_init; } if (tty) { - retval = fast_tty_open(tty); + retval = tty_reopen(tty); if (retval) return retval; *ret_tty = tty; @@ -1440,6 +1423,8 @@ int tty_init_dev(struct tty_driver *driver, int idx, * All structures have been allocated, so now we install them. * Failures after this point use release_tty to clean up, so * there's no need to null out the local pointers. + * + * FIXME: We want a 'driver->install method ? */ if (!(driver->flags & TTY_DRIVER_DEVPTS_MEM)) driver->ttys[idx] = tty; @@ -1466,9 +1451,8 @@ int tty_init_dev(struct tty_driver *driver, int idx, if (retval) goto release_mem_out; -success: - *ret_tty = tty; + *ret_tty = tty; /* All paths come through here to release the mutex */ end_init: return retval; |