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Merge tag 'tty-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

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Pull tty/serial driver updates from Greg KH:
 "Here's the big tty/serial driver update for 3.19-rc1.

  There are a number of TTY core changes/fixes in here from Peter Hurley
  that have all been teted in linux-next for a long time now.  There are
  also the normal serial driver updates as well, full details in the
  changelog below"

* tag 'tty-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (219 commits)
  serial: pxa: hold port.lock when reporting modem line changes
  tty-hvsi_lib: Deletion of an unnecessary check before the function call "tty_kref_put"
  tty: Deletion of unnecessary checks before two function calls
  n_tty: Fix read_buf race condition, increment read_head after pushing data
  serial: of-serial: add PM suspend/resume support
  Revert "serial: of-serial: add PM suspend/resume support"
  Revert "serial: of-serial: fix up PM ops on no_console_suspend and port type"
  serial: 8250: don't attempt a trylock if in sysrq
  serial: core: Add big-endian iotype
  serial: samsung: use port->fifosize instead of hardcoded values
  serial: samsung: prefer to use fifosize from driver data
  serial: samsung: fix style problems
  serial: samsung: wait for transfer completion before clock disable
  serial: icom: fix error return code
  serial: tegra: clean up tty-flag assignments
  serial: Fix io address assign flow with Fintek PCI-to-UART Product
  serial: mxs-auart: fix tx_empty against shift register
  serial: mxs-auart: fix gpio change detection on interrupt
  serial: mxs-auart: Fix mxs_auart_set_ldisc()
  serial: 8250_dw: Use 64-bit access for OCTEON.
  ...
This commit is contained in:
Linus Torvalds
2014-12-14 15:23:32 -08:00
parent e7cf773d43 dd63af108f
commit 37da7bbbe8
102 changed files with 4762 additions and 1603 deletions
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83
drivers/tty/n_tty.c
View File

@@ -321,7 +321,8 @@ static void n_tty_check_unthrottle(struct tty_struct *tty)
static inline void put_tty_queue(unsigned char c, struct n_tty_data *ldata)
{
*read_buf_addr(ldata, ldata->read_head++) = c;
*read_buf_addr(ldata, ldata->read_head) = c;
ldata->read_head++;
}
/**
@@ -351,13 +352,13 @@ static void n_tty_packet_mode_flush(struct tty_struct *tty)
{
unsigned long flags;
spin_lock_irqsave(&tty->ctrl_lock, flags);
if (tty->link->packet) {
spin_lock_irqsave(&tty->ctrl_lock, flags);
tty->ctrl_status |= TIOCPKT_FLUSHREAD;
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
if (waitqueue_active(&tty->link->read_wait))
wake_up_interruptible(&tty->link->read_wait);
}
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
}
/**
@@ -2128,7 +2129,6 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
int minimum, time;
ssize_t retval = 0;
long timeout;
unsigned long flags;
int packet;
c = job_control(tty, file);
@@ -2174,10 +2174,10 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
unsigned char cs;
if (b != buf)
break;
spin_lock_irqsave(&tty->link->ctrl_lock, flags);
spin_lock_irq(&tty->link->ctrl_lock);
cs = tty->link->ctrl_status;
tty->link->ctrl_status = 0;
spin_unlock_irqrestore(&tty->link->ctrl_lock, flags);
spin_unlock_irq(&tty->link->ctrl_lock);
if (tty_put_user(tty, cs, b++)) {
retval = -EFAULT;
b--;
@@ -2193,45 +2193,29 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
if (!input_available_p(tty, 0)) {
if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) {
up_read(&tty->termios_rwsem);
tty_flush_to_ldisc(tty);
down_read(&tty->termios_rwsem);
if (!input_available_p(tty, 0)) {
retval = -EIO;
break;
}
} else {
if (tty_hung_up_p(file))
break;
if (!timeout)
break;
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
n_tty_set_room(tty);
up_read(&tty->termios_rwsem);
timeout = wait_woken(&wait, TASK_INTERRUPTIBLE,
timeout);
down_read(&tty->termios_rwsem);
continue;
}
}
/* Deal with packet mode. */
if (packet && b == buf) {
if (tty_put_user(tty, TIOCPKT_DATA, b++)) {
retval = -EFAULT;
b--;
retval = -EIO;
break;
}
nr--;
if (tty_hung_up_p(file))
break;
if (!timeout)
break;
if (file->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
n_tty_set_room(tty);
up_read(&tty->termios_rwsem);
timeout = wait_woken(&wait, TASK_INTERRUPTIBLE,
timeout);
down_read(&tty->termios_rwsem);
continue;
}
if (ldata->icanon && !L_EXTPROC(tty)) {
@@ -2243,8 +2227,17 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
break;
} else {
int uncopied;
/* The copy function takes the read lock and handles
locking internally for this case */
/* Deal with packet mode. */
if (packet && b == buf) {
if (tty_put_user(tty, TIOCPKT_DATA, b++)) {
retval = -EFAULT;
b--;
break;
}
nr--;
}
uncopied = copy_from_read_buf(tty, &b, &nr);
uncopied += copy_from_read_buf(tty, &b, &nr);
if (uncopied) {