linux-kernel - Re: [PATCH v3] usb: dwc3: support 64 bit DMA in platform driver

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Date:   Mon, 7 Jun 2021 11:04:56 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Sven Peter <sven@...npeter.dev>,
        USB list <linux-usb@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] usb: dwc3: support 64 bit DMA in platform driver

On Mon, Jun 07, 2021 at 09:25:43AM +0200, Arnd Bergmann wrote:
> This will now  fail on machines with dwc3 connected to a 32-bit bus (or a
> bus that is accidentally not annotated as supporting 64-bit) when there is
> some memory that is not addressable through that bus.

No, it won't.  dma_set_mask_and_coherent with a 64-bit mask will never
fail if dev->dma_mask is non-NULL.