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| author |   Peter Hurley <peter@hurleysoftware.com> | 2016-04-09 17:53:22 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-30 09:26:55 -0700 |
| commit | 807c8d81f4ec441241cafa3034c58df721fee869 (patch) | |
| tree | 83402ad7f36b135d15d1aa6686ff26aa186b3dec /include/linux/tty.h | |
| parent | tty: Replace ASYNC_CTS_FLOW bit and update atomically (diff) | |
| download | linux-dev-807c8d81f4ec441241cafa3034c58df721fee869.tar.xz linux-dev-807c8d81f4ec441241cafa3034c58df721fee869.zip | |
tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically
Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.
Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/tty.h')
| -rw-r--r-- | include/linux/tty.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index 989d755b0ae4..dbeeb8666ae4 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -571,6 +571,18 @@ static inline void tty_port_set_cts_flow(struct tty_port *port, bool val) clear_bit(TTY_PORT_CTS_FLOW, &port->iflags); } +static inline bool tty_port_active(struct tty_port *port) +{ + return test_bit(TTY_PORT_ACTIVE, &port->iflags); +} + +static inline void tty_port_set_active(struct tty_port *port, bool val) +{ + if (val) + set_bit(TTY_PORT_ACTIVE, &port->iflags); + else + clear_bit(TTY_PORT_ACTIVE, &port->iflags); +} extern struct tty_struct *tty_port_tty_get(struct tty_port *port); extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); |