linux-kernel - [PATCH 1/18] ARM: OMAP: Add DMA IRQ sanity checks

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Message-Id: <117615374683-git-send-email-tony@atomide.com>
Date:	Mon,  9 Apr 2007 17:22:06 -0400
From:	Tony Lindgren <tony@...mide.com>
To:	linux-kernel@...r.kernel.org
Cc:	Juha Yrjola <juha.yrjola@...idboot.com>,
	Tony Lindgren <tony@...mide.com>
Subject: [PATCH 1/18] ARM: OMAP: Add DMA IRQ sanity checks

From: Juha Yrjola <juha.yrjola@...idboot.com>

Add DMA IRQ sanity checks

Signed-off-by: Juha Yrjola <juha.yrjola@...idboot.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 arch/arm/plat-omap/dma.c |   25 ++++++++++++++++++-------
 1 files changed, 18 insertions(+), 7 deletions(-)

--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -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;
-- 
1.4.4.2

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