linux-kernel - Re: [PATCH 2/2] amba: Initialize dma

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Message-ID: <CAK8P3a39JrMrYrNeLCr-R6y-ivkVqRkxey_Z7R4N3++MA_qqCg@mail.gmail.com>
Date:   Thu, 26 Mar 2020 12:07:18 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Haibo Chen <haibo.chen@....com>,
        Ludovic Barre <ludovic.barre@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        dmaengine@...r.kernel.org, "# 3.4.x" <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] amba: Initialize dma_parms for amba devices

On Wed, Mar 25, 2020 at 12:34 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> It's currently the amba driver's responsibility to initialize the pointer,
> dma_parms, for its corresponding struct device. The benefit with this
> approach allows us to avoid the initialization and to not waste memory for
> the struct device_dma_parameters, as this can be decided on a case by case
> basis.
>
> However, it has turned out that this approach is not very practical. Not
> only does it lead to open coding, but also to real errors. In principle
> callers of dma_set_max_seg_size() doesn't check the error code, but just
> assumes it succeeds.
>
> For these reasons, let's do the initialization from the common amba bus at
> the device registration point. This also follows the way the PCI devices
> are being managed, see pci_device_add().
>
> Suggested-by: Christoph Hellwig <hch@....de>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Acked-by: Arnd Bergmann <arnd@...db.de>