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Subject[PATCH 36/68] TTY: simserial, pass tty down to functions
Date
This avoids pain with tty refcounting and touching tty_port in the
future. It allows us to remove some state->tty tests because the tty
passed down to them can never be NULL.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
---
arch/ia64/hp/sim/simserial.c | 50 ++++++++++++++++++++----------------------
1 file changed, 24 insertions(+), 26 deletions(-)

diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index 7b6e60e..a76a27e 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -202,7 +202,8 @@ static int rs_put_char(struct tty_struct *tty, unsigned char ch)
return 1;
}

-static void transmit_chars(struct serial_state *info, int *intr_done)
+static void transmit_chars(struct tty_struct *tty, struct serial_state *info,
+ int *intr_done)
{
int count;
unsigned long flags;
@@ -220,10 +221,11 @@ static void transmit_chars(struct serial_state *info, int *intr_done)
goto out;
}

- if (info->xmit.head == info->xmit.tail || info->tty->stopped || info->tty->hw_stopped) {
+ if (info->xmit.head == info->xmit.tail || tty->stopped ||
+ tty->hw_stopped) {
#ifdef SIMSERIAL_DEBUG
printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
- info->xmit.head, info->xmit.tail, info->tty->stopped);
+ info->xmit.head, info->xmit.tail, tty->stopped);
#endif
goto out;
}
@@ -261,7 +263,7 @@ static void rs_flush_chars(struct tty_struct *tty)
!info->xmit.buf)
return;

- transmit_chars(info, NULL);
+ transmit_chars(tty, info, NULL);
}


@@ -295,7 +297,7 @@ static int rs_write(struct tty_struct * tty,
*/
if (CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE)
&& !tty->stopped && !tty->hw_stopped) {
- transmit_chars(info, NULL);
+ transmit_chars(tty, info, NULL);
}
return ret;
}
@@ -340,7 +342,7 @@ static void rs_send_xchar(struct tty_struct *tty, char ch)
* I guess we could call console->write() directly but
* let's do that for now.
*/
- transmit_chars(info, NULL);
+ transmit_chars(tty, info, NULL);
}
}

@@ -442,7 +444,7 @@ static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
* This routine will shutdown a serial port; interrupts are disabled, and
* DTR is dropped if the hangup on close termio flag is on.
*/
-static void shutdown(struct serial_state *info)
+static void shutdown(struct tty_struct *tty, struct serial_state *info)
{
unsigned long flags;

@@ -464,7 +466,7 @@ static void shutdown(struct serial_state *info)
info->xmit.buf = NULL;
}

- if (info->tty) set_bit(TTY_IO_ERROR, &info->tty->flags);
+ set_bit(TTY_IO_ERROR, &tty->flags);

info->flags &= ~ASYNC_INITIALIZED;
}
@@ -528,7 +530,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
- shutdown(info);
+ shutdown(tty, info);
rs_flush_buffer(tty);
tty_ldisc_flush(tty);
info->tty = NULL;
@@ -563,7 +565,7 @@ static void rs_hangup(struct tty_struct *tty)
rs_flush_buffer(tty);
if (info->flags & ASYNC_CLOSING)
return;
- shutdown(info);
+ shutdown(tty, info);

info->count = 0;
info->flags &= ~ASYNC_NORMAL_ACTIVE;
@@ -572,7 +574,7 @@ static void rs_hangup(struct tty_struct *tty)
}


-static int startup(struct serial_state *state)
+static int startup(struct tty_struct *tty, struct serial_state *state)
{
unsigned long flags;
int retval=0;
@@ -590,8 +592,7 @@ static int startup(struct serial_state *state)
}

if (!state->port || !state->type) {
- if (state->tty)
- set_bit(TTY_IO_ERROR, &state->tty->flags);
+ set_bit(TTY_IO_ERROR, &tty->flags);
free_page(page);
goto errout;
}
@@ -614,8 +615,7 @@ static int startup(struct serial_state *state)
goto errout;
}

- if (state->tty)
- clear_bit(TTY_IO_ERROR, &state->tty->flags);
+ clear_bit(TTY_IO_ERROR, &tty->flags);

state->xmit.head = state->xmit.tail = 0;

@@ -630,16 +630,14 @@ static int startup(struct serial_state *state)
/*
* Set up the tty->alt_speed kludge
*/
- if (state->tty) {
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- state->tty->alt_speed = 57600;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- state->tty->alt_speed = 115200;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- state->tty->alt_speed = 230400;
- if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- state->tty->alt_speed = 460800;
- }
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ tty->alt_speed = 57600;
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ tty->alt_speed = 115200;
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ tty->alt_speed = 230400;
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ tty->alt_speed = 460800;

state->flags |= ASYNC_INITIALIZED;
local_irq_restore(flags);
@@ -699,7 +697,7 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
/*
* Start up serial port
*/
- retval = startup(info);
+ retval = startup(tty, info);
if (retval) {
return retval;
}
--
1.7.9.2



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