Michal Nazarewicz 22c43c81a5
wait_event_interruptible_locked() interface ...
New wait_event_interruptible{,_exclusive}_locked{,_irq} macros added.
They work just like versions without _locked* suffix but require the
wait queue's lock to be held. Also __wake_up_locked() is now exported
as to pair it with the above macros.
The use case of this new facility is when one uses wait queue's lock
to protect a data structure. This may be advantageous if the
structure needs to be protected by a spinlock anyway. In particular,
with additional spinlock the following code has to be used to wait
for a condition:
spin_lock(&data.lock);
...
for (ret = 0; !ret && !(condition); ) {
spin_unlock(&data.lock);
ret = wait_event_interruptible(data.wqh, (condition));
spin_lock(&data.lock);
}
...
spin_unlock(&data.lock);
This looks bizarre plus wait_event_interruptible() locks the wait
queue's lock anyway so there is a unlock+lock sequence where it could
be avoided.
To avoid those problems and benefit from wait queue's lock, a code
similar to the following should be used:
/* Waiting */
spin_lock(&data.wqh.lock);
...
ret = wait_event_interruptible_locked(data.wqh, (condition));
...
spin_unlock(&data.wqh.lock);
/* Waiting exclusively */
spin_lock(&data.whq.lock);
...
ret = wait_event_interruptible_exclusive_locked(data.whq, (condition));
...
spin_unlock(&data.whq.lock);
/* Waking up */
spin_lock(&data.wqh.lock);
...
wake_up_locked(&data.wqh);
...
spin_unlock(&data.wqh.lock);
When spin_lock_irq() is used matching versions of macros need to be
used (*_locked_irq()).
Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com >
Cc: Kyungmin Park <kyungmin.park@samsung.com >
Cc: Marek Szyprowski <m.szyprowski@samsung.com >
Cc: Ingo Molnar <mingo@elte.hu >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Cc: Takashi Iwai <tiwai@suse.de >
Cc: David Howells <dhowells@redhat.com >
Cc: Andreas Herrmann <andreas.herrmann3@amd.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: Mike Galbraith <efault@gmx.de >
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de >
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22c43c81a5