Hi Greg,
This series removes ASYNC_CLOSING from kernel use. However, the definition
is in a uapi header so I think it needs to stay.
The mxser driver used ASYNC_CLOSING to purge its fifo _with each
byte received_ while closing. This is clearly unnecessary but the
hangup/shutdown sequence in that driver is spaghetti and I don't have
the hardware to test (what I would consider to be) the proper fix:
cleaning up its hangup/shutdown so that clearing the fifo can be
done once in shutdown.
The isdn subsystem used ASYNC_CLOSING for unclear purposes; the
immediate effect was to prevent sending AT commands from the
emulator, but its not clear why that's necessary when closing.
Since idsn does not use the tty_port helpers, I simply added
to isdn the equivalent of an ASYNC_CLOSING flag.
Regards,
Peter Hurley (3):
tty: mxser: Remove ASYNC_CLOSING
isdn: Remove ASYNC_CLOSING
tty: Remove ASYNC_CLOSING
drivers/isdn/i4l/isdn_tty.c | 12 ++++++------
drivers/s390/char/con3215.c | 3 +--
drivers/tty/mxser.c | 9 +++++----
drivers/tty/rocket.c | 2 +-
drivers/tty/serial/68328serial.c | 3 +--
drivers/tty/serial/crisv10.c | 3 +--
drivers/tty/serial/serial_core.c | 1 -
drivers/tty/tty_port.c | 3 +--
include/linux/isdn.h | 1 +
net/irda/ircomm/ircomm_tty.c | 4 ----
10 files changed, 17 insertions(+), 24 deletions(-)
--
2.6.3
The tty core no longer provides ASYNC_CLOSING. Use private flag for
same purpose, which is to clear the fifos at each and every interrupt
during driver close(). The driver uses this sledgehammer approach because
its close/shutdown sequence is hopelessly borked.
Signed-off-by: Peter Hurley <[email protected]>
---
drivers/tty/mxser.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 4c4a236..944da4c 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -254,6 +254,7 @@ struct mxser_port {
int xmit_head;
int xmit_tail;
int xmit_cnt;
+ int closing;
struct ktermios normal_termios;
@@ -1081,6 +1082,7 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
return;
if (tty_port_close_start(port, tty, filp) == 0)
return;
+ info->closing = 1;
mutex_lock(&port->mutex);
mxser_close_port(port);
mxser_flush_buffer(tty);
@@ -1091,6 +1093,7 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
mxser_shutdown_port(port);
clear_bit(ASYNCB_INITIALIZED, &port->flags);
mutex_unlock(&port->mutex);
+ info->closing = 0;
/* Right now the tty_port set is done outside of the close_end helper
as we don't yet have everyone using refcounts */
tty_port_close_end(port, tty);
@@ -2255,10 +2258,8 @@ static irqreturn_t mxser_interrupt(int irq, void *dev_id)
break;
iir &= MOXA_MUST_IIR_MASK;
tty = tty_port_tty_get(&port->port);
- if (!tty ||
- (port->port.flags & ASYNC_CLOSING) ||
- !(port->port.flags &
- ASYNC_INITIALIZED)) {
+ if (!tty || port->closing ||
+ !(port->port.flags & ASYNC_INITIALIZED)) {
status = inb(port->ioaddr + UART_LSR);
outb(0x27, port->ioaddr + UART_FCR);
inb(port->ioaddr + UART_MSR);
--
2.6.3
The tty core no longer provides ASYNC_CLOSING. Use private flag for
same purpose, which is to disable AT-emulator output (why this is
necessary is not clear).
Cc: Karsten Keil <[email protected]>
Signed-off-by: Peter Hurley <[email protected]>
---
drivers/isdn/i4l/isdn_tty.c | 12 ++++++------
include/linux/isdn.h | 1 +
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index cddba25..80de2a1 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -1572,7 +1572,7 @@ isdn_tty_close(struct tty_struct *tty, struct file *filp)
#endif
return;
}
- port->flags |= ASYNC_CLOSING;
+ info->closing = 1;
tty_ldisc_closing(tty);
/*
@@ -1603,6 +1603,7 @@ isdn_tty_close(struct tty_struct *tty, struct file *filp)
info->ncarrier = 0;
tty_port_close_end(port, tty);
+ info->closing = 0;
#ifdef ISDN_DEBUG_MODEM_OPEN
printk(KERN_DEBUG "isdn_tty_close normal exit\n");
#endif
@@ -2236,7 +2237,7 @@ isdn_tty_at_cout(char *msg, modem_info *info)
l = strlen(msg);
spin_lock_irqsave(&info->readlock, flags);
- if (port->flags & ASYNC_CLOSING) {
+ if (info->closing) {
spin_unlock_irqrestore(&info->readlock, flags);
return;
}
@@ -2386,13 +2387,12 @@ isdn_tty_modem_result(int code, modem_info *info)
case RESULT_NO_CARRIER:
#ifdef ISDN_DEBUG_MODEM_HUP
printk(KERN_DEBUG "modem_result: NO CARRIER %d %d\n",
- (info->port.flags & ASYNC_CLOSING),
- (!info->port.tty));
+ info->closing, !info->port.tty);
#endif
m->mdmreg[REG_RINGCNT] = 0;
del_timer(&info->nc_timer);
info->ncarrier = 0;
- if ((info->port.flags & ASYNC_CLOSING) || (!info->port.tty))
+ if (info->closing || !info->port.tty)
return;
#ifdef CONFIG_ISDN_AUDIO
@@ -2525,7 +2525,7 @@ isdn_tty_modem_result(int code, modem_info *info)
}
}
if (code == RESULT_NO_CARRIER) {
- if ((info->port.flags & ASYNC_CLOSING) || (!info->port.tty))
+ if (info->closing || (!info->port.tty))
return;
if (info->port.flags & ASYNC_CHECK_CD)
diff --git a/include/linux/isdn.h b/include/linux/isdn.h
index 1e9a0f2..df97c84 100644
--- a/include/linux/isdn.h
+++ b/include/linux/isdn.h
@@ -319,6 +319,7 @@ typedef struct modem_info {
int online; /* 1 = B-Channel is up, drop data */
/* 2 = B-Channel is up, deliver d.*/
int dialing; /* Dial in progress or ATA */
+ int closing;
int rcvsched; /* Receive needs schedule */
int isdn_driver; /* Index to isdn-driver */
int isdn_channel; /* Index to isdn-channel */
--
2.6.3
The tty core no longer provides nor uses ASYNC_CLOSING; remove from
tty_port_close_start() and tty_port_close_end() as well as tty drivers
which open-code these state changes. Unfortunately, even though the
bit is masked from userspace, its inclusion in a uapi header precludes
removing the macro.
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: [email protected]
Cc: Mikael Starvik <[email protected]>
Cc: Jesper Nilsson <[email protected]>
Cc: [email protected]
Cc: Samuel Ortiz <[email protected]>
Cc: "David S. Miller" <[email protected]>
Signed-off-by: Peter Hurley <[email protected]>
---
drivers/s390/char/con3215.c | 3 +--
drivers/tty/rocket.c | 2 +-
drivers/tty/serial/68328serial.c | 3 +--
drivers/tty/serial/crisv10.c | 3 +--
drivers/tty/serial/serial_core.c | 1 -
drivers/tty/tty_port.c | 3 +--
net/irda/ircomm/ircomm_tty.c | 4 ----
7 files changed, 5 insertions(+), 14 deletions(-)
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 715251d..057d197 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -643,7 +643,6 @@ static void raw3215_shutdown(struct raw3215_info *raw)
if ((raw->flags & RAW3215_WORKING) ||
raw->queued_write != NULL ||
raw->queued_read != NULL) {
- raw->port.flags |= ASYNC_CLOSING;
add_wait_queue(&raw->empty_wait, &wait);
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
@@ -651,7 +650,7 @@ static void raw3215_shutdown(struct raw3215_info *raw)
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
remove_wait_queue(&raw->empty_wait, &wait);
set_current_state(TASK_RUNNING);
- raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING);
+ raw->port.flags &= ~ASYNC_INITIALIZED;
}
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
}
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index b575f05..7a3a1b6 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1040,7 +1040,7 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
}
}
spin_lock_irq(&port->lock);
- info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING | ASYNC_NORMAL_ACTIVE);
+ info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_NORMAL_ACTIVE);
spin_unlock_irq(&port->lock);
mutex_unlock(&port->mutex);
tty_port_tty_set(port, NULL);
diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c
index a190a37..dd1bd3c 100644
--- a/drivers/tty/serial/68328serial.c
+++ b/drivers/tty/serial/68328serial.c
@@ -1030,7 +1030,6 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
local_irq_restore(flags);
return;
}
- port->flags |= ASYNC_CLOSING;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
@@ -1059,7 +1058,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
msleep_interruptible(jiffies_to_msecs(port->close_delay));
wake_up_interruptible(&port->open_wait);
}
- port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+ port->flags &= ~ASYNC_NORMAL_ACTIVE;
local_irq_restore(flags);
}
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index 5f2bd78..0b7dd09 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -3613,7 +3613,6 @@ rs_close(struct tty_struct *tty, struct file * filp)
local_irq_restore(flags);
return;
}
- info->port.flags |= ASYNC_CLOSING;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
@@ -3651,7 +3650,7 @@ rs_close(struct tty_struct *tty, struct file * filp)
schedule_timeout_interruptible(info->port.close_delay);
wake_up_interruptible(&info->port.open_wait);
}
- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+ info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
local_irq_restore(flags);
/* port closed */
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 418587f..cbf36df 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1434,7 +1434,6 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
* Wake up anyone trying to open this port.
*/
clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
- clear_bit(ASYNCB_CLOSING, &port->flags);
spin_unlock_irq(&port->lock);
wake_up_interruptible(&port->open_wait);
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 1fd07ef..ca5c119 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -476,7 +476,6 @@ int tty_port_close_start(struct tty_port *port,
spin_unlock_irqrestore(&port->lock, flags);
return 0;
}
- set_bit(ASYNCB_CLOSING, &port->flags);
spin_unlock_irqrestore(&port->lock, flags);
tty_ldisc_closing(tty);
@@ -514,7 +513,7 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
spin_lock_irqsave(&port->lock, flags);
wake_up_interruptible(&port->open_wait);
}
- port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
+ port->flags &= ~ASYNC_NORMAL_ACTIVE;
spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL(tty_port_close_end);
diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index a423770..db4d38c 100644
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -1268,10 +1268,6 @@ static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
sep = '|';
}
- if (self->port.flags & ASYNC_CLOSING) {
- seq_printf(m, "%cASYNC_CLOSING", sep);
- sep = '|';
- }
if (self->port.flags & ASYNC_NORMAL_ACTIVE) {
seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
sep = '|';
--
2.6.3