Merge tag 'tty-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH:
 "Here is the big set of tty/serial driver changes for 5.12-rc1.

  Nothing huge, just lots of good cleanups and additions:

   - n_tty line discipline cleanups

   - vt core cleanups and reworks to make the code more "modern"

   - stm32 driver additions

   - tty led support added to the tty core and led layer

   - minor serial driver fixups and additions

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (54 commits)
  serial: core: Remove BUG_ON(in_interrupt()) check
  vt_ioctl: Remove in_interrupt() check
  dt-bindings: serial: imx: Switch to my personal address
  vt: keyboard, use new API for keyboard_tasklet
  serial: stm32: improve platform_get_irq condition handling in init_port
  serial: ifx6x60: Remove driver for deprecated platform
  tty: fix up iterate_tty_read() EOVERFLOW handling
  tty: fix up hung_up_tty_read() conversion
  tty: fix up hung_up_tty_write() conversion
  tty: teach the n_tty ICANON case about the new "cookie continuations" too
  tty: teach n_tty line discipline about the new "cookie continuations"
  tty: clean up legacy leftovers from n_tty line discipline
  tty: implement read_iter
  tty: convert tty_ldisc_ops 'read()' function to take a kernel pointer
  serial: remove sirf prima/atlas driver
  serial: mxs-auart: Remove <asm/cacheflush.h>
  serial: mxs-auart: Remove serial_mxs_probe_dt()
  serial: fsl_lpuart: Use of_device_get_match_data()
  dt-bindings: serial: renesas,hscif: Add r8a779a0 support
  tty: serial: Drop unused efm32 serial driver
  ...

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 828f9ad1be49..ba31e97d3d96 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -975,7 +975,6 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
 	port->closing_wait    = closing_wait;
 	if (new_info->xmit_fifo_size)
 		uport->fifosize = new_info->xmit_fifo_size;
-	port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
 
  check_and_exit:
 	retval = 0;
@@ -1795,8 +1794,6 @@ static int uart_port_activate(struct tty_port *port, struct tty_struct *tty)
 	if (!uport || uport->flags & UPF_DEAD)
 		return -ENXIO;
 
-	port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
-
 	/*
 	 * Start up the serial port.
 	 */
@@ -2851,6 +2848,8 @@ static const struct attribute_group tty_dev_attr_group = {
  *	@drv: pointer to the uart low level driver structure for this port
  *	@uport: uart port structure to use for this port.
  *
+ *	Context: task context, might sleep
+ *
  *	This allows the driver to register its own uart_port structure
  *	with the core driver.  The main purpose is to allow the low
  *	level uart drivers to expand uart_port, rather than having yet
@@ -2864,8 +2863,6 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
 	struct device *tty_dev;
 	int num_groups;
 
-	BUG_ON(in_interrupt());
-
 	if (uport->line >= drv->nr)
 		return -EINVAL;
 
@@ -2954,6 +2951,8 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
  *	@drv: pointer to the uart low level driver structure for this port
  *	@uport: uart port structure for this port
  *
+ *	Context: task context, might sleep
+ *
  *	This unhooks (and hangs up) the specified port structure from the
  *	core driver.  No further calls will be made to the low-level code
  *	for this port.
@@ -2966,8 +2965,6 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
 	struct tty_struct *tty;
 	int ret = 0;
 
-	BUG_ON(in_interrupt());
-
 	mutex_lock(&port_mutex);
 
 	/*