diff options
| author | Jiri Slaby <jirislaby@gmail.com> | 2008-04-30 00:53:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:43 -0700 |
| commit | 2a5413416b6b2fd8a5a38601a4fe3b56a52cfb86 (patch) | |
| tree | 42957e12d04a369af4a481ed9b275099dd59348e /drivers | |
| parent | 2108eba5c531c12f5ae2ed2ef4cee7bf4246897b (diff) | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/moxa.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index 797284fe5fc..abcc16eba44 100644 --- a/drivers/char/moxa.c +++ b/drivers/char/moxa.c @@ -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); } /******************************************************************************/ |