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    Subject[PATCH 6/35] W1: w1_process, block when there's nothing to do
    w1.c 1.10
    Instead of sleeping with a timeout, it will now sleep with a timeout
    only when there is an active bus search. When the search is not
    active it will block until something wakes it up. kthread_stop and
    changing the search_count will wake up the thread. Now if the search
    value is changed (to request a new search) it will wake up and do the
    search immediately, rather than waiting for the end of the current
    timeout.

    Signed-off-by: David Fries <david@fries.net>
    ---
    drivers/w1/w1.c | 7 ++++++-
    1 files changed, 6 insertions(+), 1 deletions(-)

    diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
    index 7dd34f2..5d8c2c7 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;
    }
    @@ -828,7 +829,11 @@ int w1_process(void *data)
    if(kthread_should_stop())
    break;

    - schedule_timeout(jtime);
    + /* Only sleep when the search is active. */
    + if(dev->search_count)
    + schedule_timeout(jtime);
    + else
    + schedule();
    }

    atomic_dec(&dev->refcnt);
    --
    1.4.4.4[unhandled content-type:application/pgp-signature]
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