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Commit 3151369d authored by Juha Yrjola's avatar Juha Yrjola Committed by Russell King
Browse files

ARM: OMAP: Add DMA IRQ sanity checks 



Add DMA IRQ sanity checks

Signed-off-by: default avatarJuha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 277d58ef

arch/arm/plat-omap/dma.c

+18 −7
Original line number Diff line number Diff line
@@ -925,10 +925,17 @@ static int omap2_dma_handle_ch(int ch) 
{

	u32 status = OMAP_DMA_CSR_REG(ch);



	if (!status)

	if (!status) {

		if (printk_ratelimit())

			printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n", ch);

		return 0;

	if (unlikely(dma_chan[ch].dev_id == -1))

	}

	if (unlikely(dma_chan[ch].dev_id == -1)) {

		if (printk_ratelimit())

			printk(KERN_WARNING "IRQ %04x for non-allocated DMA"

					"channel %d\n", status, ch);

		return 0;

	}

	if (unlikely(status & OMAP_DMA_DROP_IRQ))

		printk(KERN_INFO

		       "DMA synchronization event drop occurred with device "
@@ -959,11 +966,15 @@ static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id) 
	int i;



	val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);



	for (i = 1; i <= OMAP_LOGICAL_DMA_CH_COUNT; i++) {

		int active = val & (1 << (i - 1));

		if (active)

			omap2_dma_handle_ch(i - 1);

	if (val == 0) {

		if (printk_ratelimit())

			printk(KERN_WARNING "Spurious DMA IRQ\n");

		return IRQ_HANDLED;

	}

	for (i = 0; i < OMAP_LOGICAL_DMA_CH_COUNT && val != 0; i++) {

		if (val & 1)

			omap2_dma_handle_ch(i);

		val >>= 1;

	}



	return IRQ_HANDLED;