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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-12-02 12:58:16 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-12-02 12:58:16 -0800 |
| commit | eed5ee1a3ab3020168cd67fdde2500452b0628c9 (patch) | |
| tree | 9548c5a4851b1a1e832b7800baf1e72b33bc7a66 /drivers/tty | |
| parent | 435a5aebf609624bdf7c5a9a7705c260d0076195 (diff) | |
| parent | a5880a9e5bb40fbae55de60051d69a29091053c3 (diff) | |
| download | linux-rpi3-eed5ee1a3ab3020168cd67fdde2500452b0628c9.tar.gz linux-rpi3-eed5ee1a3ab3020168cd67fdde2500452b0628c9.tar.bz2 linux-rpi3-eed5ee1a3ab3020168cd67fdde2500452b0628c9.zip | |
Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
* 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6:
serial: mfd: adjust the baud rate setting
TTY: open/hangup race fixup
TTY: don't allow reopen when ldisc is changing
NET: wan/x25, fix ldisc->open retval
TTY: ldisc, fix open flag handling
serial8250: Mark console as CON_ANYTIME
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/tty_io.c | 13 | ||||
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 2 |
2 files changed, 13 insertions, 2 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index c05c5af5aa04..35480dd57a30 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -559,6 +559,9 @@ void __tty_hangup(struct tty_struct *tty) tty_lock(); + /* some functions below drop BTM, so we need this bit */ + set_bit(TTY_HUPPING, &tty->flags); + /* inuse_filps is protected by the single tty lock, this really needs to change if we want to flush the workqueue with the lock held */ @@ -578,6 +581,10 @@ void __tty_hangup(struct tty_struct *tty) } spin_unlock(&tty_files_lock); + /* + * it drops BTM and thus races with reopen + * we protect the race by TTY_HUPPING + */ tty_ldisc_hangup(tty); read_lock(&tasklist_lock); @@ -615,7 +622,6 @@ void __tty_hangup(struct tty_struct *tty) tty->session = NULL; tty->pgrp = NULL; tty->ctrl_status = 0; - set_bit(TTY_HUPPED, &tty->flags); spin_unlock_irqrestore(&tty->ctrl_lock, flags); /* Account for the p->signal references we killed */ @@ -641,6 +647,7 @@ void __tty_hangup(struct tty_struct *tty) * can't yet guarantee all that. */ set_bit(TTY_HUPPED, &tty->flags); + clear_bit(TTY_HUPPING, &tty->flags); tty_ldisc_enable(tty); tty_unlock(); @@ -1310,7 +1317,9 @@ static int tty_reopen(struct tty_struct *tty) { struct tty_driver *driver = tty->driver; - if (test_bit(TTY_CLOSING, &tty->flags)) + if (test_bit(TTY_CLOSING, &tty->flags) || + test_bit(TTY_HUPPING, &tty->flags) || + test_bit(TTY_LDISC_CHANGING, &tty->flags)) return -EIO; if (driver->type == TTY_DRIVER_TYPE_PTY && diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index d8e96b005023..4214d58276f7 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -454,6 +454,8 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld) /* BTM here locks versus a hangup event */ WARN_ON(!tty_locked()); ret = ld->ops->open(tty); + if (ret) + clear_bit(TTY_LDISC_OPEN, &tty->flags); return ret; } return 0; |