linux-kernel - Re: [PATCH v8 06/11] dma-buf: provide phys

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Message-ID: <20251119133000.GB18335@unreal>
Date: Wed, 19 Nov 2025 15:30:00 +0200
From: Leon Romanovsky <leon@...nel.org>
To: "Tian, Kevin" <kevin.tian@...el.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>, Jens Axboe <axboe@...nel.dk>,
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	Jason Gunthorpe <jgg@...pe.ca>,
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	Kees Cook <kees@...nel.org>,
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	Alex Mastro <amastro@...com>, Nicolin Chen <nicolinc@...dia.com>
Subject: Re: [PATCH v8 06/11] dma-buf: provide phys_vec to scatter-gather
 mapping routine

On Wed, Nov 19, 2025 at 05:54:55AM +0000, Tian, Kevin wrote:
> > From: Leon Romanovsky <leon@...nel.org>
> > Sent: Tuesday, November 11, 2025 5:58 PM
> > +
> > +	if (dma->state && dma_use_iova(dma->state)) {
> > +		WARN_ON_ONCE(mapped_len != size);
> 
> then "goto err_unmap_dma".

It never should happen, there is no need to provide error unwind to
something that you won't get.

> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>

Thanks