If the channel has no descriptor and the interrupt is raised then the
kernel will OOPS. Check the result of vchan_next_desc() in the handler
axi_chan_block_xfer_complete() to avoid the error happening.
Signed-off-by: Ben Dooks <ben.dooks@xxxxxxxxxx>
---
drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index d6ef5f49f281..1fedf4376678 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -1082,6 +1082,11 @@ static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
/* The completed descriptor currently is in the head of vc list */
vd = vchan_next_desc(&chan->vc);
+ if (!vd) {
+ dev_err(chan2dev(chan), "BUG: %s, IRQ with no descriptors\n",
+ axi_chan_name(chan));
+ goto out;
+ }
if (chan->cyclic) {
desc = vd_to_axi_desc(vd);
@@ -1111,6 +1116,7 @@ static void axi_chan_block_xfer_complete(struct axi_dma_chan *chan)
axi_chan_start_first_queued(chan);
}
+out:
spin_unlock_irqrestore(&chan->vc.lock, flags);
}
--
2.35.1
