linux-kernel - Re: [PATCH] drm/v3d/v3d_drv: Check for error num after setting mask

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Date:   Sun, 9 Jan 2022 16:34:27 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     emma@...olt.net, airlied@...ux.ie, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/v3d/v3d_drv: Check for error num after setting mask

On 01/06, Melissa Wen wrote:
> On 01/06, Jiasheng Jiang wrote:
> > Because of the possible failure of the dma_supported(), the
> > dma_set_mask_and_coherent() may return error num.
> > Therefore, it should be better to check it and return the error if
> > fails.
> > 
> > Fixes: 334dd38a3878 ("drm/v3d: Set dma_mask as well as coherent_dma_mask")
> > Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> > ---
> >  drivers/gpu/drm/v3d/v3d_drv.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
> > index 99e22beea90b..bedd52195723 100644
> > --- a/drivers/gpu/drm/v3d/v3d_drv.c
> > +++ b/drivers/gpu/drm/v3d/v3d_drv.c
> > @@ -232,8 +232,11 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
> >  		return ret;
> >  
> >  	mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
> > -	dma_set_mask_and_coherent(dev,
> > +	ret = dma_set_mask_and_coherent(dev,
> >  		DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH)));
> > +	if (ret)
> > +		return ret;
> > +
> lgtm, thanks!
> 
Checkpatch complains when I was about to apply this change.
As the current code already has an alignment issue, here is a good
opportunity to clean it properly. I suggest to create a variable for
the mask to solve this parenthesis alignment issue.

When submitting the next version, add my r-b, please.

Thanks, Melissa

> Reviewed-by: Melissa Wen <mwen@...lia.com>
> 
> >  	v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);
> >  
> >  	ident1 = V3D_READ(V3D_HUB_IDENT1);
> > -- 
> > 2.25.1
> > 



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