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Commit d46f5e4a authored by Robert Jarzmik's avatar Robert Jarzmik Committed by Eric Miao
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[ARM] pxa/dma: optimize irq handler loop 



Reduce loop for dma irq handler callbacks to the minimum
required.

Since V1: included suggestion from Nicolas Pitre to improve
even further the loop.

Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarEric Miao <eric.y.miao@gmail.com>
parent 43c6342b

arch/arm/plat-pxa/dma.c

+15 −14
Original line number Original line Diff line number Diff line
@@ -94,10 +94,12 @@ EXPORT_SYMBOL(pxa_free_dma); 
static irqreturn_t dma_irq_handler(int irq, void *dev_id)

static irqreturn_t dma_irq_handler(int irq, void *dev_id)

{

{

	int i, dint = DINT;

	int i, dint = DINT;

	struct dma_channel *channel;





	for (i = 0; i < num_dma_channels; i++) {

	while (dint) {

		if (dint & (1 << i)) {

		i = __ffs(dint);

			struct dma_channel *channel = &dma_channels[i];

		dint &= (dint - 1);

		channel = &dma_channels[i];

		if (channel->name && channel->irq_handler) {

		if (channel->name && channel->irq_handler) {

			channel->irq_handler(i, channel->data);

			channel->irq_handler(i, channel->data);

		} else {

		} else {
@@ -109,7 +111,6 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id) 
			DCSR(i) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;

			DCSR(i) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;

		}

		}

	}

	}

	}

	return IRQ_HANDLED;

	return IRQ_HANDLED;

}

}