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Char: moxa, serialise timer

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- 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>
This commit is contained in:
Jiri Slaby 2008-04-30 00:53:45 -07:00 committed by Linus Torvalds
parent 2108eba5c5
commit 2a5413416b
1 changed files with 15 additions and 11 deletions
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26
drivers/char/moxa.c
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@ -846,10 +846,11 @@ static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
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 @@ static void __exit moxa_exit(void)
{
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 @@ static void __exit moxa_exit(void)
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 @@ static void moxa_poll(unsigned long ignored)
{
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 @@ static void moxa_poll(unsigned long ignored)
if (!brd->ready)
continue;
served++;
ip = NULL;
if (readb(brd->intPend) == 0xff)
ip = brd->intTable + readb(brd->intNdx);
@ -1460,9 +1463,10 @@ static void moxa_poll(unsigned long ignored)
}
}
moxaLowWaterChk = 0;
spin_unlock(&moxa_lock);
mod_timer(&moxaTimer, jiffies + HZ / 50);
if (served)
mod_timer(&moxaTimer, jiffies + HZ / 50);
spin_unlock(&moxa_lock);
}
/******************************************************************************/