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Date:   Fri, 23 Nov 2018 07:55:11 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     robin.murphy@arm.com, linux@armlinux.org.uk,
        Christoph Hellwig <hch@lst.de>, linux-arch@vger.kernel.org,
        linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org,
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        the arch/x86 maintainers <x86@kernel.org>,
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        iommu@lists.linux-foundation.org, jdmason@kudzu.us,
        xen-devel@lists.xenproject.org,
        linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com
Subject: Re: remove the ->mapping_error method from dma_map_ops V2
Message-ID: <20181123065511.GA17856@lst.de>
References: <20181122140320.24080-1-hch@lst.de> <CAHk-=wh=_T=A53+o4zLNbKio43LGqVDb0KCbWPDvAg54bRDmWw@mail.gmail.com> <20181122170715.GI30658@n2100.armlinux.org.uk> <CAHk-=wgfGzXuDAKFQPdzMib3QCRHfSTsy5=gLU-WCoya+Ym+1A@mail.gmail.com> <11829e3c-7302-f821-cf5c-863e5267a17b@arm.com> <CAHk-=whxf0zqutExPr_j1A625Z3gcL6k_ABzKo1BtzN4F93hkA@mail.gmail.com>
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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.