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path: root/drivers/tty/n_tty.c
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Diffstat (limited to 'drivers/tty/n_tty.c')
-rw-r--r--drivers/tty/n_tty.c54
1 files changed, 12 insertions, 42 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index a0285da02..e49c2bce5 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -201,7 +201,7 @@ static void n_tty_kick_worker(struct tty_struct *tty)
*/
WARN_RATELIMIT(test_bit(TTY_LDISC_HALTED, &tty->flags),
"scheduling buffer work for halted ldisc\n");
- queue_work(system_unbound_wq, &tty->port->buf.work);
+ tty_buffer_restart_work(tty->port);
}
}
@@ -1179,8 +1179,6 @@ static void n_tty_receive_break(struct tty_struct *tty)
put_tty_queue('\0', ldata);
}
put_tty_queue('\0', ldata);
- if (waitqueue_active(&tty->read_wait))
- wake_up_interruptible_poll(&tty->read_wait, POLLIN);
}
/**
@@ -1237,8 +1235,6 @@ static void n_tty_receive_parity_error(struct tty_struct *tty, unsigned char c)
put_tty_queue('\0', ldata);
} else
put_tty_queue(c, ldata);
- if (waitqueue_active(&tty->read_wait))
- wake_up_interruptible_poll(&tty->read_wait, POLLIN);
}
static void
@@ -2058,13 +2054,13 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
size_t eol;
size_t tail;
int ret, found = 0;
- bool eof_push = 0;
/* N.B. avoid overrun if nr == 0 */
- n = min(*nr, smp_load_acquire(&ldata->canon_head) - ldata->read_tail);
- if (!n)
+ if (!*nr)
return 0;
+ n = min(*nr + 1, smp_load_acquire(&ldata->canon_head) - ldata->read_tail);
+
tail = ldata->read_tail & (N_TTY_BUF_SIZE - 1);
size = min_t(size_t, tail + n, N_TTY_BUF_SIZE);
@@ -2085,12 +2081,11 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
n = eol - tail;
if (n > N_TTY_BUF_SIZE)
n += N_TTY_BUF_SIZE;
- n += found;
- c = n;
+ c = n + found;
- if (found && !ldata->push && read_buf(ldata, eol) == __DISABLED_CHAR) {
- n--;
- eof_push = !n && ldata->read_tail != ldata->line_start;
+ if (!found || read_buf(ldata, eol) != __DISABLED_CHAR) {
+ c = min(*nr, c);
+ n = c;
}
n_tty_trace("%s: eol:%zu found:%d n:%zu c:%zu size:%zu more:%zu\n",
@@ -2120,7 +2115,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
ldata->push = 0;
tty_audit_push(tty);
}
- return eof_push ? -EAGAIN : 0;
+ return 0;
}
extern ssize_t redirected_tty_write(struct file *, const char __user *,
@@ -2142,37 +2137,15 @@ extern ssize_t redirected_tty_write(struct file *, const char __user *,
static int job_control(struct tty_struct *tty, struct file *file)
{
- struct pid *pgrp;
-
/* Job control check -- must be done at start and after
every sleep (POSIX.1 7.1.1.4). */
/* NOTE: not yet done after every sleep pending a thorough
check of the logic of this change. -- jlc */
/* don't stop on /dev/console */
- if (file->f_op->write == redirected_tty_write ||
- current->signal->tty != tty)
+ if (file->f_op->write == redirected_tty_write)
return 0;
- rcu_read_lock();
- pgrp = task_pgrp(current);
-
- spin_lock_irq(&tty->ctrl_lock);
- if (!tty->pgrp)
- printk(KERN_ERR "n_tty_read: no tty->pgrp!\n");
- else if (pgrp != tty->pgrp) {
- spin_unlock_irq(&tty->ctrl_lock);
- if (is_ignored(SIGTTIN) || is_current_pgrp_orphaned()) {
- rcu_read_unlock();
- return -EIO;
- }
- kill_pgrp(pgrp, SIGTTIN, 1);
- rcu_read_unlock();
- set_thread_flag(TIF_SIGPENDING);
- return -ERESTARTSYS;
- }
- spin_unlock_irq(&tty->ctrl_lock);
- rcu_read_unlock();
- return 0;
+ return __tty_check_change(tty, SIGTTIN);
}
@@ -2299,10 +2272,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
if (ldata->icanon && !L_EXTPROC(tty)) {
retval = canon_copy_from_read_buf(tty, &b, &nr);
- if (retval == -EAGAIN) {
- retval = 0;
- continue;
- } else if (retval)
+ if (retval)
break;
} else {
int uncopied;