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W1: w1_process, block or sleep

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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 <david@fries.net>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Fries 2008-10-15 22:04:41 -07:00 committed by Linus Torvalds
parent 01e14d6db9
commit 3c52e4e627
3 changed files with 17 additions and 9 deletions
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20
drivers/w1/w1.c
View file

@ -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);

4
drivers/w1/w1.h
View file

@ -149,8 +149,6 @@ struct w1_bus_master
u8, w1_slave_found_callback);
};
#define W1_MASTER_NEED_EXIT 0
struct w1_master
{
struct list_head w1_master_entry;
@ -169,8 +167,6 @@ struct w1_master
void *priv;
int priv_size;
long flags;
struct task_struct *thread;
struct mutex mutex;

2
drivers/w1/w1_int.c
View file

@ -142,7 +142,6 @@ int w1_add_master_device(struct w1_bus_master *master)
#if 0 /* Thread cleanup code, not required currently. */
err_out_kill_thread:
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
kthread_stop(dev->thread);
#endif
err_out_rm_attr:
@ -158,7 +157,6 @@ void __w1_remove_master_device(struct w1_master *dev)
struct w1_netlink_msg msg;
struct w1_slave *sl, *sln;
set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
kthread_stop(dev->thread);
mutex_lock(&w1_mlock);