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Commit cb335768 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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Revert "mailbox: forward the hrtimer if not queued and under a lock" 



This reverts commit 16b5013f which is
commit bca1a1004615efe141fd78f360ecc48c60bc4ad5 upstream.

It breaks the kernel api and isn't anything that is relevant for Android
systems as it was already fixed in Android in a different way, so it can
be reverted.

Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
Change-Id: I49bf9cf61438dbd002eaf89dc0c1ce514fd66e17
parent 9508bece

drivers/mailbox/mailbox.c

+6 −14
Original line number Diff line number Diff line
@@ -90,7 +90,6 @@ static int __msg_submit(struct mbox_chan *chan) 


static void msg_submit(struct mbox_chan *chan)

{

	unsigned long flags;

	int err = 0;



	/*
@@ -104,11 +103,11 @@ static void msg_submit(struct mbox_chan *chan) 
		err = __msg_submit(chan);

	} while (err == -EAGAIN);



	if (!err && (chan->txdone_method & TXDONE_BY_POLL)) {

	/* kick start the timer immediately to avoid delays */

		spin_lock_irqsave(&chan->mbox->poll_hrt_lock, flags);

	if (!err && (chan->txdone_method & TXDONE_BY_POLL)) {

		/* but only if not already active */

		if (!hrtimer_active(&chan->mbox->poll_hrt))

			hrtimer_start(&chan->mbox->poll_hrt, 0, HRTIMER_MODE_REL);

		spin_unlock_irqrestore(&chan->mbox->poll_hrt_lock, flags);

	}

}
@@ -142,26 +141,20 @@ static enum hrtimer_restart txdone_hrtimer(struct hrtimer *hrtimer) 
		container_of(hrtimer, struct mbox_controller, poll_hrt);

	bool txdone, resched = false;

	int i;

	unsigned long flags;



	for (i = 0; i < mbox->num_chans; i++) {

		struct mbox_chan *chan = &mbox->chans[i];



		if (chan->active_req && chan->cl) {

			resched = true;

			txdone = chan->mbox->ops->last_tx_done(chan);

			if (txdone)

				tx_tick(chan, 0);

			else

				resched = true;

		}

	}



	if (resched) {

		spin_lock_irqsave(&mbox->poll_hrt_lock, flags);

		if (!hrtimer_is_queued(hrtimer))

		hrtimer_forward_now(hrtimer, ms_to_ktime(mbox->txpoll_period));

		spin_unlock_irqrestore(&mbox->poll_hrt_lock, flags);



		return HRTIMER_RESTART;

	}

	return HRTIMER_NORESTART;
@@ -498,7 +491,6 @@ int mbox_controller_register(struct mbox_controller *mbox) 
		hrtimer_init(&mbox->poll_hrt, CLOCK_MONOTONIC,

			     HRTIMER_MODE_REL);

		mbox->poll_hrt.function = txdone_hrtimer;

		spin_lock_init(&mbox->poll_hrt_lock);

	}



	for (i = 0; i < mbox->num_chans; i++) {

include/linux/mailbox_controller.h

+0 −1
Original line number Diff line number Diff line
@@ -83,7 +83,6 @@ struct mbox_controller { 
				      const struct of_phandle_args *sp);

	/* Internal to API */

	struct hrtimer poll_hrt;

	spinlock_t poll_hrt_lock;

	struct list_head node;

};