Re: [PATCH 07/20] dmaengine: at_hdmac: drop useless LIST_HEAD

Ludovic Desroches
2018-12-24T09:36:20Z

On Sun, Dec 23, 2018 at 09:57:02AM +0100, Julia Lawall wrote:
> Drop LIST_HEAD where the variable it declares is never used.
>
> tmp_list has been declared since the introduction of the driver
> and has never been used. The two declarations of list were
> introduced with the containing functions but were also not used.
>
> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> identifier x;
> @@
> - LIST_HEAD(x);
> ... when != x
> // </smpl>
>
> Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller")
> Fixes: 4facfe7f09f2b ("dmaengine: hdmac: Split device_control")
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>

Thanks
>
> ---
> Successfully 0-day tested on 151 configurations.
>
> drivers/dma/at_hdmac.c | 5 -----
> 1 file changed, 5 deletions(-)
>
> diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
> index 01d936c9fe89..a0a9cd76c1d4 100644
> --- a/drivers/dma/at_hdmac.c
> +++ b/drivers/dma/at_hdmac.c
> @@ -134,7 +134,6 @@ static struct at_desc *atc_desc_get(struct at_dma_chan *atchan)
> struct at_desc *ret = NULL;
> unsigned long flags;
> unsigned int i = 0;
> - LIST_HEAD(tmp_list);
>
> spin_lock_irqsave(&atchan->lock, flags);
> list_for_each_entry_safe(desc, _desc, &atchan->free_list, desc_node) {
> @@ -1387,8 +1386,6 @@ static int atc_pause(struct dma_chan *chan)
> int chan_id = atchan->chan_common.chan_id;
> unsigned long flags;
>
> - LIST_HEAD(list);
> -
> dev_vdbg(chan2dev(chan), "%s\n", __func__);
>
> spin_lock_irqsave(&atchan->lock, flags);
> @@ -1408,8 +1405,6 @@ static int atc_resume(struct dma_chan *chan)
> int chan_id = atchan->chan_common.chan_id;
> unsigned long flags;
>
> - LIST_HEAD(list);
> -
> dev_vdbg(chan2dev(chan), "%s\n", __func__);
>
> if (!atc_chan_is_paused(atchan))