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 <[email protected]> Acked-by: Linus Walleij <[email protected]> Signed-off-by: Fabio Baltieri <[email protected]> --- drivers/dma/ste_dma40.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 2ecefb7..a97bbd3 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) -- 1.7.12.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
