Merge tag 'tty-4.4-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 tty and serial driver update for 4.4-rc1.

  Lots of serial driver updates and a few small tty core changes.  Full
  details in the shortlog.

  All of these have been in linux-next for a while"

* tag 'tty-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (148 commits)
  tty: Use unbound workqueue for all input workers
  tty: Abstract tty buffer work
  tty: Prevent tty teardown during tty_write_message()
  tty: core: Use correct spinlock flavor in tiocspgrp()
  tty: Combine SIGTTOU/SIGTTIN handling
  serial: amba-pl011: fix incorrect integer size in pl011_fifo_to_tty()
  ttyFDC: Fix build problems due to use of module_{init,exit}
  tty: remove unneeded return statement
  serial: 8250_mid: add support for DMA engine handling from UART MMIO
  dmaengine: hsu: remove platform data
  dmaengine: hsu: introduce stubs for the exported functions
  dmaengine: hsu: make the UART driver in control of selecting this driver
  serial: fix mctrl helper functions
  serial: 8250_pci: Intel MID UART support to its own driver
  serial: fsl_lpuart: add earlycon support
  tty: disable unbind for old 74xx based serial/mpsc console port
  serial: pl011: Spelling s/clocks-names/clock-names/
  n_tty: Remove reader wakeups for TTY_BREAK/TTY_PARITY chars
  tty: synclink, fix indentation
  serial: at91, fix rs485 properties
  ...

5 files changed, 16 insertions, 61 deletions

diff --git a/include/linux/dma/hsu.h b/include/linux/dma/hsu.h
index 234393a6997b..79df69dc629c 100644
--- a/include/linux/dma/hsu.h
+++ b/include/linux/dma/hsu.h
@@ -35,14 +35,23 @@ struct hsu_dma_chip {
 	unsigned int			length;
 	unsigned int			offset;
 	struct hsu_dma			*hsu;
-	struct hsu_dma_platform_data	*pdata;
 };
 
+#if IS_ENABLED(CONFIG_HSU_DMA)
 /* Export to the internal users */
 irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr);
 
 /* Export to the platform drivers */
 int hsu_dma_probe(struct hsu_dma_chip *chip);
 int hsu_dma_remove(struct hsu_dma_chip *chip);
+#else
+static inline irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip,
+				      unsigned short nr)
+{
+	return IRQ_NONE;
+}
+static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; }
+static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; }
+#endif /* CONFIG_HSU_DMA */
 
 #endif /* _DMA_HSU_H */
diff --git a/include/linux/n_r3964.h b/include/linux/n_r3964.h
index 5d0b2a1dee69..90a803aa42e8 100644
--- a/include/linux/n_r3964.h
+++ b/include/linux/n_r3964.h
@@ -152,9 +152,6 @@ struct r3964_info {
 	unsigned char *rx_buf;            /* ring buffer */
 	unsigned char *tx_buf;
 
-	wait_queue_head_t read_wait;
-	//struct wait_queue *read_wait;
-
 	struct r3964_block_header *rx_first;
 	struct r3964_block_header *rx_last;
 	struct r3964_block_header *tx_first;
@@ -164,8 +161,9 @@ struct r3964_info {
 	unsigned char last_rx;
 	unsigned char bcc;
         unsigned int  blocks_in_rx_queue;
-	  
-	
+
+	struct mutex read_lock;		/* serialize r3964_read */
+
 	struct r3964_client_info *firstClient;
 	unsigned int state;
 	unsigned int flags;
diff --git a/include/linux/platform_data/atmel.h b/include/linux/platform_data/atmel.h
index bdc0ee8e84e9..91b16adab0cd 100644
--- a/include/linux/platform_data/atmel.h
+++ b/include/linux/platform_data/atmel.h
@@ -19,12 +19,6 @@
 #include <linux/serial.h>
 #include <linux/platform_data/macb.h>
 
-/*
- * at91: 6 USARTs and one DBGU port (SAM9260)
- * avr32: 4
- */
-#define ATMEL_MAX_UART	7
-
  /* Compact Flash */
 struct at91_cf_data {
 	int	irq_pin;		/* I/O IRQ */
diff --git a/include/linux/platform_data/dma-hsu.h b/include/linux/platform_data/dma-hsu.h
index 8a1f6a4920b2..3453fa655502 100644
--- a/include/linux/platform_data/dma-hsu.h
+++ b/include/linux/platform_data/dma-hsu.h
@@ -18,8 +18,4 @@ struct hsu_dma_slave {
 	int		chan_id;
 };
 
-struct hsu_dma_platform_data {
-	unsigned short	nr_channels;
-};
-
 #endif /* _PLATFORM_DATA_DMA_HSU_H */
diff --git a/include/linux/tty.h b/include/linux/tty.h
index d072ded41678..5b04b0a5375b 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -227,7 +227,6 @@ struct tty_port {
 	int			blocked_open;	/* Waiting to open */
 	int			count;		/* Usage count */
 	wait_queue_head_t	open_wait;	/* Open waiters */
-	wait_queue_head_t	close_wait;	/* Close waiters */
 	wait_queue_head_t	delta_msr_wait;	/* Modem status change */
 	unsigned long		flags;		/* TTY flags ASY_*/
 	unsigned char		console:1,	/* port is a console */
@@ -424,6 +423,7 @@ extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 			      const char *routine);
 extern const char *tty_name(const struct tty_struct *tty);
 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
+extern int __tty_check_change(struct tty_struct *tty, int sig);
 extern int tty_check_change(struct tty_struct *tty);
 extern void __stop_tty(struct tty_struct *tty);
 extern void stop_tty(struct tty_struct *tty);
@@ -467,6 +467,8 @@ extern void tty_buffer_free_all(struct tty_port *port);
 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
 extern void tty_buffer_init(struct tty_port *port);
 extern void tty_buffer_set_lock_subclass(struct tty_port *port);
+extern bool tty_buffer_restart_work(struct tty_port *port);
+extern bool tty_buffer_cancel_work(struct tty_port *port);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
@@ -656,50 +658,6 @@ extern void __lockfunc tty_unlock(struct tty_struct *tty);
 extern void __lockfunc tty_lock_slave(struct tty_struct *tty);
 extern void __lockfunc tty_unlock_slave(struct tty_struct *tty);
 extern void tty_set_lock_subclass(struct tty_struct *tty);
-/*
- * this shall be called only from where BTM is held (like close)
- *
- * We need this to ensure nobody waits for us to finish while we are waiting.
- * Without this we were encountering system stalls.
- *
- * This should be indeed removed with BTM removal later.
- *
- * Locking: BTM required. Nobody is allowed to hold port->mutex.
- */
-static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
-		long timeout)
-{
-	tty_unlock(tty); /* tty->ops->close holds the BTM, drop it while waiting */
-	tty_wait_until_sent(tty, timeout);
-	tty_lock(tty);
-}
-
-/*
- * wait_event_interruptible_tty -- wait for a condition with the tty lock held
- *
- * The condition we are waiting for might take a long time to
- * become true, or might depend on another thread taking the
- * BTM. In either case, we need to drop the BTM to guarantee
- * forward progress. This is a leftover from the conversion
- * from the BKL and should eventually get removed as the BTM
- * falls out of use.
- *
- * Do not use in new code.
- */
-#define wait_event_interruptible_tty(tty, wq, condition)		\
-({									\
-	int __ret = 0;							\
-	if (!(condition))						\
-		__ret = __wait_event_interruptible_tty(tty, wq,		\
-						       condition);	\
-	__ret;								\
-})
-
-#define __wait_event_interruptible_tty(tty, wq, condition)		\
-	___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0,		\
-			tty_unlock(tty);				\
-			schedule();					\
-			tty_lock(tty))
 
 #ifdef CONFIG_PROC_FS
 extern void proc_tty_register_driver(struct tty_driver *);