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ARM: OMAP: Add DMA IRQ sanity checks

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Add DMA IRQ sanity checks

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Juha Yrjola 2006-12-06 17:13:47 -08:00 • committed by Russell King
parent 277d58efad
commit 3151369d74
1 changed files with 18 additions and 7 deletions
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25
arch/arm/plat-omap/dma.c
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@ -925,10 +925,17 @@ static int omap2_dma_handle_ch(int ch)
{ {
u32 status = OMAP_DMA_CSR_REG(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; 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; return 0;
}
if (unlikely(status & OMAP_DMA_DROP_IRQ)) if (unlikely(status & OMAP_DMA_DROP_IRQ))
printk(KERN_INFO printk(KERN_INFO
"DMA synchronization event drop occurred with device " "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; int i;
val = omap_readl(OMAP_DMA4_IRQSTATUS_L0); val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
if (val == 0) {
for (i = 1; i <= OMAP_LOGICAL_DMA_CH_COUNT; i++) { if (printk_ratelimit())
int active = val & (1 << (i - 1)); printk(KERN_WARNING "Spurious DMA IRQ\n");
if (active) return IRQ_HANDLED;
omap2_dma_handle_ch(i - 1); }
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; return IRQ_HANDLED;