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dmaengine: set_dma40: ignore spurious interrupts

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Some DMA channels may be used by other cores in the SoC.  This patch
modifies the dma interrupt handler to ignore interrupts from unknown
channels.

Cc: Rabin Vincent <rabin.vincent@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
This commit is contained in:
Fabio Baltieri 2012-12-19 14:41:56 +01:00
parent 7407048bec
commit 53d6d68f3c
1 changed files with 12 additions and 3 deletions
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15
drivers/dma/ste_dma40.c
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@ -1677,13 +1677,22 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
row = chan / BITS_PER_LONG;
idx = chan & (BITS_PER_LONG - 1);
/* ACK interrupt */
writel(1 << idx, base->virtbase + il[row].clr);
if (il[row].offset == D40_PHY_CHAN)
d40c = base->lookup_phy_chans[idx];
else
d40c = base->lookup_log_chans[il[row].offset + idx];
if (!d40c) {
/*
* No error because this can happen if something else
* in the system is using the channel.
*/
continue;
}
/* ACK interrupt */
writel(1 << idx, base->virtbase + il[row].clr);
spin_lock(&d40c->lock);
if (!il[row].is_error)