From: Akinobu Mita Date: Mon, 13 Oct 2008 09:35:05 +0000 (+0100) Subject: ip2: avoid add_timer with pending timer X-Git-Tag: v2.6.28-rc1~672 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=9d020a2e5fd2c79f5b08a6cab2b02e7231d7cb84;p=linux-2.6-omap-h63xx.git 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 Signed-off-by: Jiri Slaby Signed-off-by: Alan Cox Signed-off-by: Linus Torvalds --- diff --git a/drivers/char/ip2/ip2main.c b/drivers/char/ip2/ip2main.c index 39269d19a02..66f52a28c40 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 ); }