netdev - Re: [PATCHv2] usb: hso: obey DMA rules in tiocmget

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Message-ID: <87tv87qvd4.fsf@ossau.homelinux.net>
Date:   Thu, 17 Oct 2019 15:50:31 +0100
From:   Neil Jerram <neiljerram@...tab.net>
To:     Oliver Neukum <oneukum@...e.com>, davem@...emloft.net,
        netdev@...r.kernel.org, johan@...nel.org
Subject: Re: [PATCHv2] usb: hso: obey DMA rules in tiocmget

Oliver Neukum <oneukum@...e.com> writes:

> The serial state information must not be embedded into another
> data structure, as this interferes with cache handling for DMA
> on architectures without cache coherence..
> That would result in data corruption on some architectures

Could you say more what you mean by "some architectures"?  I wonder if
this is responsible for long-standing flakiness dealing with the HSO
modem in the GTA04 phone?

Best wishes,
   Neil