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Date:   Wed, 14 Aug 2019 06:19:51 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Suwan Kim <suwan.kim027@gmail.com>
Cc:     shuah@kernel.org, valentina.manea.m@gmail.com,
        gregkh@linuxfoundation.org, stern@rowland.harvard.edu,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 0/2] usbip: Implement SG support
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FYI, I think my

   "usb: add a HCD_DMA flag instead of guestimating DMA capabilities"

is the proper core fix for what your patch 1 works around, as the USB
core should not assume DMA capabilities based on the presence of a DMA
mask.