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Commit 53d6d68f authored by Fabio Baltieri's avatar Fabio Baltieri
Browse files

dmaengine: set_dma40: ignore spurious interrupts 



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: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarFabio Baltieri <fabio.baltieri@linaro.org>
parent 7407048b

drivers/dma/ste_dma40.c

+12 −3
Original line number Diff line number Diff line
@@ -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)