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authorAkinobu Mita <akinobu.mita@gmail.com>2008-10-13 10:35:05 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 09:51:39 -0700
commit9d020a2e5fd2c79f5b08a6cab2b02e7231d7cb84 (patch)
tree2c3d42f2a0fd4617d2e708e91dae6bbc4b4a5c15 /drivers/char
parentf1ddfd950221cca4d7ba753a71bc4b8930a42a43 (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.c19
1 files changed, 4 insertions, 15 deletions
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 );
}