diff options
| author | Akinobu Mita <akinobu.mita@gmail.com> | 2008-10-13 10:35:05 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-13 09:51:39 -0700 |
| commit | 9d020a2e5fd2c79f5b08a6cab2b02e7231d7cb84 (patch) | |
| tree | 2c3d42f2a0fd4617d2e708e91dae6bbc4b4a5c15 /drivers/char | |
| parent | f1ddfd950221cca4d7ba753a71bc4b8930a42a43 (diff) | |
ip2: avoid add_timer with pending timer
add_timer() is not supposed to be called when the timer is pending.
ip2 driver attempts to avoid that condition by setting and resetting
a flag (TimerOn) in timer function. But there is some gap between
add_timer() and setting TimerOn.
This patch fix this problem by using mod_timer() and remove TimerOn
which has been unnecessary by this change.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/ip2/ip2main.c | 19 |
1 files changed, 4 insertions, 15 deletions
diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c index 39269d19a02d..66f52a28c40b 100644 --- a/drivers/char/ip2/ip2main.c +++ b/drivers/char/ip2/ip2main.c @@ -249,7 +249,6 @@ static unsigned long bh_counter; */ #define POLL_TIMEOUT (jiffies + 1) static DEFINE_TIMER(PollTimer, ip2_poll, 0, 0); -static char TimerOn; #ifdef IP2DEBUG_TRACE /* Trace (debug) buffer data */ @@ -374,11 +373,7 @@ static void __exit ip2_cleanup_module(void) int err; int i; - /* Stop poll timer if we had one. */ - if (TimerOn) { - del_timer(&PollTimer); - TimerOn = 0; - } + del_timer_sync(&PollTimer); /* Reset the boards we have. */ for (i = 0; i < IP2_MAX_BOARDS; i++) @@ -774,10 +769,8 @@ static int __init ip2_loadmain(void) } if (ip2config.irq[i] == CIR_POLL) { retry: - if (!TimerOn) { - PollTimer.expires = POLL_TIMEOUT; - add_timer(&PollTimer); - TimerOn = 1; + if (!timer_pending(&PollTimer)) { + mod_timer(&PollTimer, POLL_TIMEOUT); printk(KERN_INFO "IP2: polling\n"); } } else { @@ -1283,16 +1276,12 @@ ip2_poll(unsigned long arg) { ip2trace (ITRC_NO_PORT, ITRC_INTR, 100, 0 ); - TimerOn = 0; // it's the truth but not checked in service - // Just polled boards, IRQ = 0 will hit all non-interrupt boards. // It will NOT poll boards handled by hard interrupts. // The issue of queued BH interrupts is handled in ip2_interrupt(). ip2_polled_interrupt(); - PollTimer.expires = POLL_TIMEOUT; - add_timer( &PollTimer ); - TimerOn = 1; + mod_timer(&PollTimer, POLL_TIMEOUT); ip2trace (ITRC_NO_PORT, ITRC_INTR, ITRC_RETURN, 0 ); } |