linux-kernel - Re: remove the ->mapping_error method from dma_map

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Message-ID: <20181128074117.GA21126@lst.de>
Date:   Wed, 28 Nov 2018 08:41:17 +0100
From:   Christoph Hellwig <hch@....de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-arch@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org,
        David Woodhouse <dwmw2@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        linux@...linux.org.uk,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        iommu@...ts.linux-foundation.org, linux-alpha@...r.kernel.org,
        xen-devel@...ts.xenproject.org, robin.murphy@....com,
        Christoph Hellwig <hch@....de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: remove the ->mapping_error method from dma_map_ops V2

On Fri, Nov 23, 2018 at 07:55:11AM +0100, Christoph Hellwig wrote:
> On Thu, Nov 22, 2018 at 09:55:25AM -0800, Linus Torvalds wrote:
> > No, the big immediate benefit of allowing "return -EINVAL" etc is
> > simply legibility and error avoidance.
> 
> Well, I can tweak the last patch to return -EINVAL from dma_mapping_error
> instead of the old 1 is as bool true.  The callers should all be fine,
> although I'd have to audit them.  Still wouldn't help with being able to
> return different errors.

Any opinions?  I'd really like to make some forward progress on this
series.