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Message-id: <125803142268083366.slaby@pripojeni.net>
Date: Fri, 9 Nov 2007 18:41:30 -0500
From: Jiri Slaby <jirislaby@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: [PATCH 4/6] Char: stallion, remove bottomhalf
stallion, remove bottomhalf
- tty_hangup schedules a bottomhalf itself, tty_wakeup doesn't need it
- call the CD code (part of work handler previously) directly from the code
(it wakes somebody up or calls tty_hangup at worse)
Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
---
commit 695ec3fa93346e03d33392504ca99aaaeb4cb5f7
tree 70fd73f9647f302e08082555cb45b1bdbdcfc3da
parent fb6091801dc98a44bd22f04acd4e66524eb0be9c
author Jiri Slaby <jirislaby@...il.com> Mon, 05 Nov 2007 16:27:41 +0100
committer Jiri Slaby <jirislaby@...il.com> Fri, 09 Nov 2007 22:42:56 +0100
drivers/char/stallion.c | 68 ++++++++++++++++------------------------------
include/linux/stallion.h | 1 -
2 files changed, 24 insertions(+), 45 deletions(-)
diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 5050aa5..feac54e 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -145,8 +145,7 @@ static struct stlbrd *stl_brds[STL_MAXBRDS];
*/
#define ASYI_TXBUSY 1
#define ASYI_TXLOW 2
-#define ASYI_DCDCHANGE 3
-#define ASYI_TXFLOWED 4
+#define ASYI_TXFLOWED 3
/*
* Define an array of board names as printable strings. Handy for
@@ -610,6 +609,23 @@ static const struct file_operations stl_fsiomem = {
static struct class *stallion_class;
+static void stl_cd_change(struct stlport *portp)
+{
+ unsigned int oldsigs = portp->sigs;
+
+ if (!portp->tty)
+ return;
+
+ portp->sigs = stl_getsignals(portp);
+
+ if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
+ wake_up_interruptible(&portp->open_wait);
+
+ if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0))
+ if (portp->flags & ASYNC_CHECK_CD)
+ tty_hangup(portp->tty);
+}
+
/*
* Check for any arguments passed in on the module load command line.
*/
@@ -1771,41 +1787,6 @@ static int stl_echpci64intr(struct stlbrd *brdp)
/*****************************************************************************/
/*
- * Service an off-level request for some channel.
- */
-static void stl_offintr(struct work_struct *work)
-{
- struct stlport *portp = container_of(work, struct stlport, tqueue);
- struct tty_struct *tty;
- unsigned int oldsigs;
-
- pr_debug("stl_offintr(portp=%p)\n", portp);
-
- if (portp == NULL)
- return;
-
- tty = portp->tty;
- if (tty == NULL)
- return;
-
- if (test_bit(ASYI_TXLOW, &portp->istate))
- tty_wakeup(tty);
-
- if (test_bit(ASYI_DCDCHANGE, &portp->istate)) {
- clear_bit(ASYI_DCDCHANGE, &portp->istate);
- oldsigs = portp->sigs;
- portp->sigs = stl_getsignals(portp);
- if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
- wake_up_interruptible(&portp->open_wait);
- if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0))
- if (portp->flags & ASYNC_CHECK_CD)
- tty_hangup(tty); /* FIXME: module removal race here - AKPM */
- }
-}
-
-/*****************************************************************************/
-
-/*
* Initialize all the ports on a panel.
*/
@@ -1840,7 +1821,6 @@ static int __devinit stl_initports(struct stlbrd *brdp, struct stlpanel *panelp)
portp->baud_base = STL_BAUDBASE;
portp->close_delay = STL_CLOSEDELAY;
portp->closing_wait = 30 * HZ;
- INIT_WORK(&portp->tqueue, stl_offintr);
init_waitqueue_head(&portp->open_wait);
init_waitqueue_head(&portp->close_wait);
portp->stats.brd = portp->brdnr;
@@ -3530,7 +3510,8 @@ static void stl_cd1400txisr(struct stlpanel *panelp, int ioaddr)
if ((len == 0) || ((len < STL_TXBUFLOW) &&
(test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
set_bit(ASYI_TXLOW, &portp->istate);
- schedule_work(&portp->tqueue);
+ if (portp->tty)
+ tty_wakeup(portp->tty);
}
if (len == 0) {
@@ -3693,8 +3674,7 @@ static void stl_cd1400mdmisr(struct stlpanel *panelp, int ioaddr)
outb((MISR + portp->uartaddr), ioaddr);
misr = inb(ioaddr + EREG_DATA);
if (misr & MISR_DCD) {
- set_bit(ASYI_DCDCHANGE, &portp->istate);
- schedule_work(&portp->tqueue);
+ stl_cd_change(portp);
portp->stats.modem++;
}
@@ -4448,7 +4428,8 @@ static void stl_sc26198txisr(struct stlport *portp)
if ((len == 0) || ((len < STL_TXBUFLOW) &&
(test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
set_bit(ASYI_TXLOW, &portp->istate);
- schedule_work(&portp->tqueue);
+ if (portp->tty)
+ tty_wakeup(portp->tty);
}
if (len == 0) {
@@ -4649,8 +4630,7 @@ static void stl_sc26198otherisr(struct stlport *portp, unsigned int iack)
case CIR_SUBCOS:
ipr = stl_sc26198getreg(portp, IPR);
if (ipr & IPR_DCDCHANGE) {
- set_bit(ASYI_DCDCHANGE, &portp->istate);
- schedule_work(&portp->tqueue);
+ stl_cd_change(portp);
portp->stats.modem++;
}
break;
diff --git a/include/linux/stallion.h b/include/linux/stallion.h
index 94b4a10..0424d75 100644
--- a/include/linux/stallion.h
+++ b/include/linux/stallion.h
@@ -95,7 +95,6 @@ struct stlport {
struct tty_struct *tty;
wait_queue_head_t open_wait;
wait_queue_head_t close_wait;
- struct work_struct tqueue;
comstats_t stats;
struct stlrq tx;
};
-
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