On 08-07-22, 18:01, Ben Dooks wrote:
> 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.
Applied, thanks
>
> 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
--
~Vinod
