Char: moxa, serialise timer
- del timer after we are sure it won't be fired again
- make timer scheduling atomic
- don't reschedule timer when all cards have gone
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Tested-by: Oyvind Aabling <Oyvind.Aabling@uni-c.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index 797284f..abcc16e 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -846,10 +846,11 @@
if (ret)
goto err_free;
+ spin_lock_bh(&moxa_lock);
brd->ready = 1;
-
if (!timer_pending(&moxaTimer))
mod_timer(&moxaTimer, jiffies + HZ / 50);
+ spin_unlock_bh(&moxa_lock);
return 0;
err_free:
@@ -1041,13 +1042,6 @@
{
int i;
- del_timer_sync(&moxaTimer);
-
- if (tty_unregister_driver(moxaDriver))
- printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
- "serial driver\n");
- put_tty_driver(moxaDriver);
-
#ifdef CONFIG_PCI
pci_unregister_driver(&moxa_pci_driver);
#endif
@@ -1055,6 +1049,13 @@
for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
if (moxa_boards[i].ready)
moxa_board_deinit(&moxa_boards[i]);
+
+ del_timer_sync(&moxaTimer);
+
+ if (tty_unregister_driver(moxaDriver))
+ printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
+ "serial driver\n");
+ put_tty_driver(moxaDriver);
}
module_init(moxa_init);
@@ -1432,7 +1433,7 @@
{
struct moxa_board_conf *brd;
u16 __iomem *ip;
- unsigned int card, port;
+ unsigned int card, port, served = 0;
spin_lock(&moxa_lock);
for (card = 0; card < MAX_BOARDS; card++) {
@@ -1440,6 +1441,8 @@
if (!brd->ready)
continue;
+ served++;
+
ip = NULL;
if (readb(brd->intPend) == 0xff)
ip = brd->intTable + readb(brd->intNdx);
@@ -1460,9 +1463,10 @@
}
}
moxaLowWaterChk = 0;
- spin_unlock(&moxa_lock);
- mod_timer(&moxaTimer, jiffies + HZ / 50);
+ if (served)
+ mod_timer(&moxaTimer, jiffies + HZ / 50);
+ spin_unlock(&moxa_lock);
}
/******************************************************************************/