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Commit 083be28a authored by Russell King's avatar Russell King
Browse files

dmaengine: PL08x: use vchan's spinlock 



Initialize the vchan struct, and use the provided spinlock rather than
our own.

Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 01d8dc64

drivers/dma/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ config AMBA_PL08X 
	bool "ARM PrimeCell PL080 or PL081 support"

	depends on ARM_AMBA && EXPERIMENTAL

	select DMA_ENGINE

	select DMA_VIRTUAL_CHANNELS

	help

	  Platform has a PL08x DMAC device

	  which can provide DMA engine support

drivers/dma/amba-pl08x.c

+20 −25
Original line number Diff line number Diff line
@@ -237,7 +237,6 @@ struct pl08x_dma_chan { 
	struct list_head issued_list;

	struct list_head done_list;

	struct pl08x_txd *at;

	spinlock_t lock;

	struct pl08x_driver_data *host;

	enum pl08x_dma_chan_state state;

	bool slave;
@@ -484,7 +483,7 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) 
	unsigned long flags;

	size_t bytes = 0;



	spin_lock_irqsave(&plchan->lock, flags);

	spin_lock_irqsave(&plchan->vc.lock, flags);

	ch = plchan->phychan;

	txd = plchan->at;
@@ -543,7 +542,7 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) 
		}

	}



	spin_unlock_irqrestore(&plchan->lock, flags);

	spin_unlock_irqrestore(&plchan->vc.lock, flags);



	return bytes;

}
@@ -673,12 +672,12 @@ static void pl08x_phy_free(struct pl08x_dma_chan *plchan) 
		 * Eww.  We know this isn't going to deadlock

		 * but lockdep probably doesn't.

		 */

		spin_lock(&next->lock);

		spin_lock(&next->vc.lock);

		/* Re-check the state now that we have the lock */

		success = next->state == PL08X_CHAN_WAITING;

		if (success)

			pl08x_phy_reassign_start(plchan->phychan, next);

		spin_unlock(&next->lock);

		spin_unlock(&next->vc.lock);



		/* If the state changed, try to find another channel */

		if (!success)
@@ -1125,12 +1124,12 @@ static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx) 
	unsigned long flags;

	dma_cookie_t cookie;



	spin_lock_irqsave(&plchan->lock, flags);

	spin_lock_irqsave(&plchan->vc.lock, flags);

	cookie = dma_cookie_assign(tx);



	/* Put this onto the pending list */

	list_add_tail(&txd->node, &plchan->pend_list);

	spin_unlock_irqrestore(&plchan->lock, flags);

	spin_unlock_irqrestore(&plchan->vc.lock, flags);



	return cookie;

}
@@ -1318,13 +1317,13 @@ static void pl08x_issue_pending(struct dma_chan *chan) 
	struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);

	unsigned long flags;



	spin_lock_irqsave(&plchan->lock, flags);

	spin_lock_irqsave(&plchan->vc.lock, flags);

	list_splice_tail_init(&plchan->pend_list, &plchan->issued_list);

	if (!list_empty(&plchan->issued_list)) {

		if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING)

			pl08x_phy_alloc_and_start(plchan);

	}

	spin_unlock_irqrestore(&plchan->lock, flags);

	spin_unlock_irqrestore(&plchan->vc.lock, flags);

}



static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
@@ -1337,9 +1336,9 @@ static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, 
	if (!num_llis) {

		unsigned long flags;



		spin_lock_irqsave(&plchan->lock, flags);

		spin_lock_irqsave(&plchan->vc.lock, flags);

		pl08x_free_txd(pl08x, txd);

		spin_unlock_irqrestore(&plchan->lock, flags);

		spin_unlock_irqrestore(&plchan->vc.lock, flags);



		return -EINVAL;

	}
@@ -1551,9 +1550,9 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, 
	 * Anything succeeds on channels with no physical allocation and

	 * no queued transfers.

	 */

	spin_lock_irqsave(&plchan->lock, flags);

	spin_lock_irqsave(&plchan->vc.lock, flags);

	if (!plchan->phychan && !plchan->at) {

		spin_unlock_irqrestore(&plchan->lock, flags);

		spin_unlock_irqrestore(&plchan->vc.lock, flags);

		return 0;

	}
@@ -1592,7 +1591,7 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, 
		break;

	}



	spin_unlock_irqrestore(&plchan->lock, flags);

	spin_unlock_irqrestore(&plchan->vc.lock, flags);



	return ret;

}
@@ -1664,9 +1663,9 @@ static void pl08x_tasklet(unsigned long data) 
	unsigned long flags;

	LIST_HEAD(head);



	spin_lock_irqsave(&plchan->lock, flags);

	spin_lock_irqsave(&plchan->vc.lock, flags);

	list_splice_tail_init(&plchan->done_list, &head);

	spin_unlock_irqrestore(&plchan->lock, flags);

	spin_unlock_irqrestore(&plchan->vc.lock, flags);



	while (!list_empty(&head)) {

		struct pl08x_txd *txd = list_first_entry(&head,
@@ -1681,9 +1680,9 @@ static void pl08x_tasklet(unsigned long data) 
			pl08x_unmap_buffers(txd);



		/* Free the descriptor */

		spin_lock_irqsave(&plchan->lock, flags);

		spin_lock_irqsave(&plchan->vc.lock, flags);

		pl08x_free_txd(pl08x, txd);

		spin_unlock_irqrestore(&plchan->lock, flags);

		spin_unlock_irqrestore(&plchan->vc.lock, flags);



		/* Callback to signal completion */

		if (callback)
@@ -1724,7 +1723,7 @@ static irqreturn_t pl08x_irq(int irq, void *dev) 
				continue;

			}



			spin_lock(&plchan->lock);

			spin_lock(&plchan->vc.lock);

			tx = plchan->at;

			if (tx) {

				plchan->at = NULL;
@@ -1745,7 +1744,7 @@ static irqreturn_t pl08x_irq(int irq, void *dev) 
				else

					pl08x_phy_free(plchan);

			}

			spin_unlock(&plchan->lock);

			spin_unlock(&plchan->vc.lock);



			/* Schedule tasklet on this channel */

			tasklet_schedule(&plchan->tasklet);
@@ -1808,17 +1807,13 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, 
			 "initialize virtual channel \"%s\"\n",

			 chan->name);



		chan->vc.chan.device = dmadev;

		dma_cookie_init(&chan->vc.chan);



		spin_lock_init(&chan->lock);

		INIT_LIST_HEAD(&chan->pend_list);

		INIT_LIST_HEAD(&chan->issued_list);

		INIT_LIST_HEAD(&chan->done_list);

		tasklet_init(&chan->tasklet, pl08x_tasklet,

			     (unsigned long) chan);



		list_add_tail(&chan->vc.chan.device_node, &dmadev->channels);

		vchan_init(&chan->vc, dmadev);

	}

	dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",

		 i, slave ? "slave" : "memcpy");