From 53d6d68f3c1792bce0144d8499435468e425a995 Mon Sep 17 00:00:00 2001 From: Fabio Baltieri Date: Wed, 19 Dec 2012 14:41:56 +0100 Subject: 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 Acked-by: Linus Walleij Acked-by: Vinod Koul Signed-off-by: Fabio Baltieri --- drivers/dma/ste_dma40.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'drivers/dma') diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 2ecefb7113b9..a97bbd3a4a47 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -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) -- cgit v1.2.3-55-g7522