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Date: Tue, 29 Apr 2008 14:26:11 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: akpm@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] tty: Add throttle/unthrottle helpers
Something Arjan suggested which allows us to clean up the code nicely
Signed-off-by: Alan Cox <alan@...hat.com>
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/char/tty_ioctl.c linux-2.6.25-mm1/drivers/char/tty_ioctl.c
--- linux.vanilla-2.6.25-mm1/drivers/char/tty_ioctl.c 2008-04-28 11:36:48.000000000 +0100
+++ linux-2.6.25-mm1/drivers/char/tty_ioctl.c 2008-04-14 14:27:41.000000000 +0100
@@ -67,6 +67,24 @@
EXPORT_SYMBOL(tty_driver_flush_buffer);
+void tty_throttle(struct tty_struct *tty)
+{
+ /* check TTY_THROTTLED first so it indicates our state */
+ if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
+ tty->ops->throttle)
+ tty->ops->throttle(tty);
+}
+
+EXPORT_SYMBOL(tty_throttle);
+
+void tty_unthrottle(struct tty_struct *tty)
+{
+ if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
+ tty->ops->unthrottle)
+ tty->ops->unthrottle(tty);
+}
+
+EXPORT_SYMBOL(tty_unthrottle);
/**
* tty_wait_until_sent - wait for I/O to finish
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/include/linux/tty_driver.h linux-2.6.25-mm1/include/linux/tty_driver.h
--- linux.vanilla-2.6.25-mm1/include/linux/tty_driver.h 2008-04-28 11:36:52.000000000 +0100
+++ linux-2.6.25-mm1/include/linux/tty_driver.h 2008-04-14 14:27:30.000000000 +0100
@@ -83,10 +83,10 @@
* void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
*
* This routine allows the tty driver to be notified when
- * device's termios settings have changed.
+ * device's termios settings have changed.
*
* Optional: Called under the termios lock
*
*
* void (*set_ldisc)(struct tty_struct *tty);
*
@@ -100,6 +100,8 @@
* This routine notifies the tty driver that input buffers for
* the line discipline are close to full, and it should somehow
* signal that no more characters should be sent to the tty.
+ *
+ * Optional: Always invoke via tty_throttle();
*
* void (*unthrottle)(struct tty_struct * tty);
*
@@ -107,12 +109,14 @@
* that characters can now be sent to the tty without fear of
* overrunning the input buffers of the line disciplines.
*
+ * Optional: Always invoke via tty_unthrottle();
+ *
* void (*stop)(struct tty_struct *tty);
*
* This routine notifies the tty driver that it should stop
* outputting characters to the tty device.
*
- * Optional:
+ * Optional:
*
* Note: Call stop_tty not this method.
*
@@ -141,7 +145,7 @@
*
* If this routine is implemented, the high-level tty driver will
* handle the following ioctls: TCSBRK, TCSBRKP, TIOCSBRK,
- * TIOCCBRK.
+ * TIOCCBRK.
*
* Optional: Required for TCSBRK/BRKP/etc handling.
*
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/include/linux/tty.h linux-2.6.25-mm1/include/linux/tty.h
--- linux.vanilla-2.6.25-mm1/include/linux/tty.h 2008-04-28 11:36:52.000000000 +0100
+++ linux-2.6.25-mm1/include/linux/tty.h 2008-04-28 12:26:36.000000000 +0100
@@ -303,6 +321,8 @@
extern int tty_chars_in_buffer(struct tty_struct *tty);
extern int tty_write_room(struct tty_struct *tty);
extern void tty_driver_flush_buffer(struct tty_struct *tty);
+extern void tty_throttle(struct tty_struct *tty);
+extern void tty_unthrottle(struct tty_struct *tty);
extern int is_current_pgrp_orphaned(void);
extern struct pid *tty_get_pgrp(struct tty_struct *tty);
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/bluetooth/hci_ldisc.c linux-2.6.25-mm1/drivers/bluetooth/hci_ldisc.c
--- linux.vanilla-2.6.25-mm1/drivers/bluetooth/hci_ldisc.c 2008-04-28 11:36:48.000000000 +0100
+++ linux-2.6.25-mm1/drivers/bluetooth/hci_ldisc.c 2008-04-28 11:43:39.000000000 +0100
@@ -370,9 +370,7 @@
hu->hdev->stat.byte_rx += count;
spin_unlock(&hu->rx_lock);
- if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
- tty->ops->unthrottle)
- tty->ops->unthrottle(tty);
+ tty_unthrottle(tty);
}
static int hci_uart_register_dev(struct hci_uart *hu)
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/char/n_tty.c linux-2.6.25-mm1/drivers/char/n_tty.c
--- linux.vanilla-2.6.25-mm1/drivers/char/n_tty.c 2008-04-28 11:36:48.000000000 +0100
+++ linux-2.6.25-mm1/drivers/char/n_tty.c 2008-04-14 14:26:29.000000000 +0100
@@ -147,10 +147,8 @@
static void check_unthrottle(struct tty_struct *tty)
{
- if (tty->count &&
- test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
- tty->ops->unthrottle)
- tty->ops->unthrottle(tty);
+ if (tty->count)
+ tty_unthrottle(tty);
}
/**
@@ -982,12 +980,8 @@
* mode. We don't want to throttle the driver if we're in
* canonical mode and don't have a newline yet!
*/
- if (tty->receive_room < TTY_THRESHOLD_THROTTLE) {
- /* check TTY_THROTTLED first so it indicates our state */
- if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
- tty->ops->throttle)
- tty->ops->throttle(tty);
- }
+ if (tty->receive_room < TTY_THRESHOLD_THROTTLE)
+ tty_throttle(tty);
}
int is_ignored(int sig)
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/net/hamradio/6pack.c linux-2.6.25-mm1/drivers/net/hamradio/6pack.c
--- linux.vanilla-2.6.25-mm1/drivers/net/hamradio/6pack.c 2008-04-28 11:36:49.000000000 +0100
+++ linux-2.6.25-mm1/drivers/net/hamradio/6pack.c 2008-04-14 14:29:14.000000000 +0100
@@ -491,9 +491,7 @@
sixpack_decode(sp, buf, count1);
sp_put(sp);
- if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
- && tty->ops->unthrottle)
- tty->ops->unthrottle(tty);
+ tty_unthrottle(tty);
}
/*
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/net/hamradio/mkiss.c linux-2.6.25-mm1/drivers/net/hamradio/mkiss.c
--- linux.vanilla-2.6.25-mm1/drivers/net/hamradio/mkiss.c 2008-04-28 11:36:49.000000000 +0100
+++ linux-2.6.25-mm1/drivers/net/hamradio/mkiss.c 2008-04-14 14:29:29.000000000 +0100
@@ -936,9 +936,7 @@
}
mkiss_put(ax);
- if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
- && tty->ops->unthrottle)
- tty->ops->unthrottle(tty);
+ tty_unthrottle(tty);
}
/*
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/net/ppp_async.c linux-2.6.25-mm1/drivers/net/ppp_async.c
--- linux.vanilla-2.6.25-mm1/drivers/net/ppp_async.c 2008-04-28 11:36:49.000000000 +0100
+++ linux-2.6.25-mm1/drivers/net/ppp_async.c 2008-04-14 14:28:29.000000000 +0100
@@ -361,9 +361,7 @@
if (!skb_queue_empty(&ap->rqueue))
tasklet_schedule(&ap->tsk);
ap_put(ap);
- if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
- && tty->ops->unthrottle)
- tty->ops->unthrottle(tty);
+ tty_unthrottle(tty);
}
static void
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/net/ppp_synctty.c linux-2.6.25-mm1/drivers/net/ppp_synctty.c
--- linux.vanilla-2.6.25-mm1/drivers/net/ppp_synctty.c 2008-04-28 11:36:49.000000000 +0100
+++ linux-2.6.25-mm1/drivers/net/ppp_synctty.c 2008-04-14 14:28:46.000000000 +0100
@@ -401,9 +401,7 @@
if (!skb_queue_empty(&ap->rqueue))
tasklet_schedule(&ap->tsk);
sp_put(ap);
- if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)
- && tty->ops->unthrottle)
- tty->ops->unthrottle(tty);
+ tty_unthrottle(tty);
}
static void
--
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