linux-kernel - Re: [PATCH] PCI: epf-mhi: Fix the DMA data direction of dma_unmap

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Message-ID: <20231215110012.GA13113@thinkpad>
Date: Fri, 15 Dec 2023 16:30:12 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Krzysztof Wilczyński <kw@...ux.com>
Cc: lpieralisi@...nel.org, bhelgaas@...gle.com, kishon@...nel.org,
	mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: epf-mhi: Fix the DMA data direction of
 dma_unmap_single()

On Fri, Dec 15, 2023 at 04:35:21AM +0900, Krzysztof Wilczyński wrote:
> Hello,
> 
> > In the error path of pci_epf_mhi_edma_write() function, the DMA data
> > direction passed (DMA_FROM_DEVICE) doesn't match the actual direction used
> > for the data transfer. Fix it by passing the correct one (DMA_TO_DEVICE).
> 
> Nice catch!
> 
> > Fixes: 7b99aaaddabb ("PCI: epf-mhi: Add eDMA support")
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> > 
> > Bjorn, Krzysztof, I'd like to apply this patch to MHI tree on top of eDMA
> > async patches due to dependency:
> > https://lore.kernel.org/linux-pci/20231127124529.78203-1-manivannan.sadhasivam@linaro.org/
> 
> Sounds good to me!  We still have a little time, so let me know if you
> change your mind about who should take this patch and the other series. :)
> 

No change in plan :)

> >  drivers/pci/endpoint/functions/pci-epf-mhi.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
> > index 472bc489b754..d3d6a1054036 100644
> > --- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
> > +++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
> > @@ -424,7 +424,7 @@ static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl,
> >  	}
> >  
> >  err_unmap:
> > -	dma_unmap_single(dma_dev, src_addr, buf_info->size, DMA_FROM_DEVICE);
> > +	dma_unmap_single(dma_dev, src_addr, buf_info->size, DMA_TO_DEVICE);
> >  err_unlock:
> >  	mutex_unlock(&epf_mhi->lock);
> 
> Looks good!
> 
> Reviewed-by: Krzysztof Wilczyński <kw@...ux.com>
> 

Thanks! Applied to mhi-next.

- Mani

> 	Krzysztof

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