Merge tag 'tty-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
 "Here is the big TTY / Serial driver merge for 3.11-rc1.

  It's not all that big, nothing major changed in the tty api, which is
  a nice change, just a number of serial driver fixes and updates and
  new drivers, along with some n_tty fixes to help resolve some reported
  issues.

  All of these have been in the linux-next releases for a while, with
  the exception of the last revert patch, which was reported this past
  weekend by two different people as being needed."

* tag 'tty-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (51 commits)
  Revert "serial: 8250_pci: add support for another kind of NetMos Technology PCI 9835 Multi-I/O Controller"
  pch_uart: Add uart_clk selection for the MinnowBoard
  tty: atmel_serial: prepare clk before calling enable
  tty: Reset itty for other pty
  n_tty: Buffer work should not reschedule itself
  n_tty: Fix unsafe update of available buffer space
  n_tty: Untangle read completion variables
  n_tty: Encapsulate minimum_to_wake within N_TTY
  serial: omap: Fix device tree based PM runtime
  serial: imx: Fix serial clock unbalance
  serial/mpc52xx_uart: fix kernel panic when system reboot
  serial: mfd: Add sysrq support
  serial: imx: enable the clocks for console
  tty: serial: add Freescale lpuart driver support
  serial: imx: Improve Kconfig text
  serial: imx: Allow module build
  serial: imx: Fix warning when !CONFIG_SERIAL_IMX_CONSOLE
  tty/serial/sirf: fix error propagation in sirfsoc_uart_probe()
  serial: omap: fix potential NULL pointer dereference in serial_omap_runtime_suspend()
  tty: serial: Enable uartlite for ARM zynq
  ...

5 files changed, 59 insertions, 8 deletions

diff --git a/include/linux/console.h b/include/linux/console.h
index 73bab0f58af5..7571a16bd653 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -75,10 +75,7 @@ extern const struct consw newport_con;	/* SGI Newport console  */
 extern const struct consw prom_con;     /* SPARC PROM console */
 
 int con_is_bound(const struct consw *csw);
-int register_con_driver(const struct consw *csw, int first, int last);
-int unregister_con_driver(const struct consw *csw);
 int do_unregister_con_driver(const struct consw *csw);
-int take_over_console(const struct consw *sw, int first, int last, int deflt);
 int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
 void give_up_console(const struct consw *sw);
 #ifdef CONFIG_HW_CONSOLE
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 87d4bbc773fc..b98291ac7f14 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -31,6 +31,13 @@
 #include <linux/sysrq.h>
 #include <uapi/linux/serial_core.h>
 
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+#define uart_console(port) \
+        ((port)->cons && (port)->cons->index == (port)->line)
+#else
+#define uart_console(port)      (0)
+#endif
+
 struct uart_port;
 struct serial_struct;
 struct device;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 8780bd2a272a..01ac30efd6a6 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -272,7 +272,6 @@ struct tty_struct {
 #define N_TTY_BUF_SIZE 4096
 
         unsigned char closing:1;
-        unsigned short minimum_to_wake;
         unsigned char *write_buf;
         int write_cnt;
         /* If the tty has a pending do_SAK, queue it here - akpm */
@@ -309,8 +308,6 @@ struct tty_file_private {
 #define TTY_LDISC               9       /* Line discipline attached */
 #define TTY_LDISC_CHANGING      10      /* Line discipline changing */
 #define TTY_LDISC_OPEN          11      /* Line discipline is open */
-#define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
-#define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 #define TTY_PTY_LOCK            16      /* pty private */
 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 #define TTY_HUPPED              18      /* Post driver->hangup() */
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index 58390c73df8b..a1b048999821 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -100,6 +100,11 @@
  *      seek to perform this action quickly but should wait until
  *      any pending driver I/O is completed.
  *
+ * void (*fasync)(struct tty_struct *, int on)
+ *
+ *      Notify line discipline when signal-driven I/O is enabled or
+ *      disabled.
+ *
  * void (*dcd_change)(struct tty_struct *tty, unsigned int status)
  *
  *      Tells the discipline that the DCD pin has changed its status.
@@ -110,6 +115,52 @@
 #include <linux/wait.h>
 #include <linux/wait.h>
 
+
+/*
+ * the semaphore definition
+ */
+struct ld_semaphore {
+        long                    count;
+        raw_spinlock_t          wait_lock;
+        unsigned int            wait_readers;
+        struct list_head        read_wait;
+        struct list_head        write_wait;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+        struct lockdep_map      dep_map;
+#endif
+};
+
+extern void __init_ldsem(struct ld_semaphore *sem, const char *name,
+                         struct lock_class_key *key);
+
+#define init_ldsem(sem)                                         \
+do {                                                            \
+        static struct lock_class_key __key;                     \
+                                                                \
+        __init_ldsem((sem), #sem, &__key);                      \
+} while (0)
+
+
+extern int ldsem_down_read(struct ld_semaphore *sem, long timeout);
+extern int ldsem_down_read_trylock(struct ld_semaphore *sem);
+extern int ldsem_down_write(struct ld_semaphore *sem, long timeout);
+extern int ldsem_down_write_trylock(struct ld_semaphore *sem);
+extern void ldsem_up_read(struct ld_semaphore *sem);
+extern void ldsem_up_write(struct ld_semaphore *sem);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+extern int ldsem_down_read_nested(struct ld_semaphore *sem, int subclass,
+                                  long timeout);
+extern int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
+                                   long timeout);
+#else
+# define ldsem_down_read_nested(sem, subclass, timeout)         \
+                ldsem_down_read(sem, timeout)
+# define ldsem_down_write_nested(sem, subclass, timeout)        \
+                ldsem_down_write(sem, timeout)
+#endif
+
+
 struct tty_ldisc_ops {
         int     magic;
         char    *name;
@@ -143,6 +194,7 @@ struct tty_ldisc_ops {
                                char *fp, int count);
         void    (*write_wakeup)(struct tty_struct *);
         void    (*dcd_change)(struct tty_struct *, unsigned int);
+        void    (*fasync)(struct tty_struct *tty, int on);
 
         struct  module *owner;
 
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index 0d33fca48774..8d7634247fb4 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -133,8 +133,6 @@ void change_console(struct vc_data *new_vc);
 void reset_vc(struct vc_data *vc);
 extern int do_unbind_con_driver(const struct consw *csw, int first, int last,
                              int deflt);
-extern int unbind_con_driver(const struct consw *csw, int first, int last,
-                             int deflt);
 int vty_init(const struct file_operations *console_fops);
 
 static inline bool vt_force_oops_output(struct vc_data *vc)