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Message-ID: <4113bbafa3c69526392f9be5dcdff86a72f339a3.camel@pengutronix.de>
Date: Mon, 17 Jul 2023 11:58:48 +0200
From: Lucas Stach <l.stach@...gutronix.de>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>,
Russell King <linux+etnaviv@...linux.org.uk>,
Christian Gmeiner <christian.gmeiner@...il.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>
Cc: loongson-kernel@...ts.loongnix.cn,
Sui Jingfeng <suijingfeng@...ngson.cn>,
etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/8] drm/etnaviv: Remove surplus else after return
Am Freitag, dem 23.06.2023 um 18:08 +0800 schrieb Sui Jingfeng:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
>
> Because the 'else' is not generally useful after the 'return'.
While your cleanup is a correct rewrite of the function, the current
code in this function is bogus, as we need to check for the
bidirectional (READ | WRITE) case first. Currently we just pick the
DMA_FROM_DEVICE direction when both flags are set, which is clearly not
right.
Regards,
Lucas
>
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
> drivers/gpu/drm/etnaviv/etnaviv_gem.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> index be2f459c66b5..271470723d5e 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> @@ -358,10 +358,11 @@ static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
> {
> if (op & ETNA_PREP_READ)
> return DMA_FROM_DEVICE;
> - else if (op & ETNA_PREP_WRITE)
> +
> + if (op & ETNA_PREP_WRITE)
> return DMA_TO_DEVICE;
> - else
> - return DMA_BIDIRECTIONAL;
> +
> + return DMA_BIDIRECTIONAL;
> }
>
> int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
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