dmaengine: set_dma40: ignore spurious interrupts (53d6d68f) · Commits · 戴 / test

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>

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)

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