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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2018-06-28 09:57:42 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-07 17:38:57 +0200 |
| commit | e890591413819eeb604207ad3261ba617b2ec0bb (patch) | |
| tree | 16d356d9ca2a3c2de4f07cee8ea1b681406578b7 /drivers/siox | |
| parent | 7e6f7d24535b7c1edec3605d85c7684f7388d122 (diff) | |
| download | linux-rpi-e890591413819eeb604207ad3261ba617b2ec0bb.tar.gz linux-rpi-e890591413819eeb604207ad3261ba617b2ec0bb.tar.bz2 linux-rpi-e890591413819eeb604207ad3261ba617b2ec0bb.zip | |
siox: don't create a thread without starting it
When a siox master device is registered a kthread is created that is
only started when triggered by userspace. So this thread might be in
TASK_UNINTERRUPTIBLE state for long and trigger a warning
[ 241.130465] INFO: task siox-0:626 blocked for more than 120 seconds.
with the respective debug settings enabled. It might be right to put an
unstarted thread to TASK_IDLE (in kernel/kthread.c:kthread()) instead,
but independant of this discussion it is cleaner for
siox_master_register() to start the thread immediately. The effect is
that it enters its own waiting state and then stays in state TASK_IDLE
which doesn't trigger the above warning.
As siox_poll_thread() uses some variables of the device the
initialisation of these is moved before thread creation.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Gavin Schenk <g.schenk@eckelmann.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/siox')
| -rw-r--r-- | drivers/siox/siox-core.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/siox/siox-core.c b/drivers/siox/siox-core.c index 3115f930fa83..f8c08fb9891d 100644 --- a/drivers/siox/siox-core.c +++ b/drivers/siox/siox-core.c @@ -715,17 +715,17 @@ int siox_master_register(struct siox_master *smaster) dev_set_name(&smaster->dev, "siox-%d", smaster->busno); + mutex_init(&smaster->lock); + INIT_LIST_HEAD(&smaster->devices); + smaster->last_poll = jiffies; - smaster->poll_thread = kthread_create(siox_poll_thread, smaster, - "siox-%d", smaster->busno); + smaster->poll_thread = kthread_run(siox_poll_thread, smaster, + "siox-%d", smaster->busno); if (IS_ERR(smaster->poll_thread)) { smaster->active = 0; return PTR_ERR(smaster->poll_thread); } - mutex_init(&smaster->lock); - INIT_LIST_HEAD(&smaster->devices); - ret = device_add(&smaster->dev); if (ret) kthread_stop(smaster->poll_thread); |