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| author | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-26 20:07:25 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-26 20:07:25 -0800 |
| commit | dd7c7c3f69291baa488b8a50db683d5fbf44166a (patch) | |
| tree | 925bf294f30dffaa67a983c3859926ff53937e14 /drivers/tty/tty_ldisc.c | |
| parent | 161e773cbd0c3d1b5b8cc00602e1f72de61ed4f7 (diff) | |
| parent | caca6a03d365883564885f2c1da3e88dcf65d139 (diff) | |
Merge 3.2-rc3 into tty-next to handle merge conflict in tty_ldisc.c
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/tty_ldisc.c')
| -rw-r--r-- | drivers/tty/tty_ldisc.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c index 174db3b0c09..24b95db75d8 100644 --- a/drivers/tty/tty_ldisc.c +++ b/drivers/tty/tty_ldisc.c @@ -18,6 +18,7 @@ #include <linux/bitops.h> #include <linux/seq_file.h> #include <linux/uaccess.h> +#include <linux/ratelimit.h> /* * This guards the refcounted line discipline lists. The lock @@ -529,15 +530,16 @@ static void tty_ldisc_flush_works(struct tty_struct *tty) /** * tty_ldisc_wait_idle - wait for the ldisc to become idle * @tty: tty to wait for + * @timeout: for how long to wait at most * * Wait for the line discipline to become idle. The discipline must * have been halted for this to guarantee it remains idle. */ -static int tty_ldisc_wait_idle(struct tty_struct *tty) +static int tty_ldisc_wait_idle(struct tty_struct *tty, long timeout) { - int ret; + long ret; ret = wait_event_timeout(tty_ldisc_idle, - atomic_read(&tty->ldisc->users) == 1, 5 * HZ); + atomic_read(&tty->ldisc->users) == 1, timeout); return ret > 0 ? 0 : -EBUSY; } @@ -645,7 +647,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) tty_ldisc_flush_works(tty); - retval = tty_ldisc_wait_idle(tty); + retval = tty_ldisc_wait_idle(tty, 5 * HZ); tty_lock(); mutex_lock(&tty->ldisc_mutex); @@ -742,8 +744,6 @@ static int tty_ldisc_reinit(struct tty_struct *tty, int ldisc) if (IS_ERR(ld)) return -1; - WARN_ON_ONCE(tty_ldisc_wait_idle(tty)); - tty_ldisc_close(tty, tty->ldisc); tty_ldisc_put(tty->ldisc); tty->ldisc = NULL; @@ -818,7 +818,7 @@ void tty_ldisc_hangup(struct tty_struct *tty) tty_unlock(); cancel_work_sync(&tty->buf.work); mutex_unlock(&tty->ldisc_mutex); - +retry: tty_lock(); mutex_lock(&tty->ldisc_mutex); @@ -827,6 +827,22 @@ void tty_ldisc_hangup(struct tty_struct *tty) it means auditing a lot of other paths so this is a FIXME */ if (tty->ldisc) { /* Not yet closed */ + if (atomic_read(&tty->ldisc->users) != 1) { + char cur_n[TASK_COMM_LEN], tty_n[64]; + long timeout = 3 * HZ; + tty_unlock(); + + while (tty_ldisc_wait_idle(tty, timeout) == -EBUSY) { + timeout = MAX_SCHEDULE_TIMEOUT; + printk_ratelimited(KERN_WARNING + "%s: waiting (%s) for %s took too long, but we keep waiting...\n", + __func__, get_task_comm(cur_n, current), + tty_name(tty, tty_n)); + } + mutex_unlock(&tty->ldisc_mutex); + goto retry; + } + if (reset == 0) { if (!tty_ldisc_reinit(tty, tty->termios->c_line)) |