From 3c52e4e627896b42152cc6ff98216c302932227e Mon Sep 17 00:00:00 2001 From: David Fries Date: Wed, 15 Oct 2008 22:04:41 -0700 Subject: W1: w1_process, block or sleep The w1_process thread's sleeping and termination has been modified. msleep_interruptible was replaced by schedule_timeout and schedule to allow for kthread_stop and wake_up_process to interrupt the sleep and the unbounded sleeping when a bus search is disabled. The W1_MASTER_NEED_EXIT and flags variable were removed as they were redundant with kthread_should_stop and kthread_stop. If w1_process is sleeping, requesting a search will immediately wake it up rather than waiting for the end of msleep_interruptible previously. Signed-off-by: David Fries Signed-off-by: Evgeniy Polyakov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/w1/w1.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) (limited to 'drivers/w1/w1.c') diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 730faa49d8d..9b5c11701c3 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -251,6 +251,7 @@ static ssize_t w1_master_attribute_store_search(struct device * dev, mutex_lock(&md->mutex); md->search_count = simple_strtol(buf, NULL, 0); mutex_unlock(&md->mutex); + wake_up_process(md->thread); return count; } @@ -773,7 +774,7 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb tmp64 = (triplet_ret >> 2); rn |= (tmp64 << i); - if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { + if (kthread_should_stop()) { printk(KERN_INFO "Abort w1_search (exiting)\n"); return; } @@ -811,8 +812,12 @@ void w1_search_process(struct w1_master *dev, u8 search_type) int w1_process(void *data) { struct w1_master *dev = (struct w1_master *) data; + /* As long as w1_timeout is only set by a module parameter the sleep + * time can be calculated in jiffies once. + */ + const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); - while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { + while (!kthread_should_stop()) { if (dev->search_count) { mutex_lock(&dev->mutex); w1_search_process(dev, W1_SEARCH); @@ -820,7 +825,16 @@ int w1_process(void *data) } try_to_freeze(); - msleep_interruptible(w1_timeout * 1000); + __set_current_state(TASK_INTERRUPTIBLE); + + if (kthread_should_stop()) + break; + + /* Only sleep when the search is active. */ + if (dev->search_count) + schedule_timeout(jtime); + else + schedule(); } atomic_dec(&dev->refcnt); -- cgit v1.2.3