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From: Suwan Kim <suwan.kim027@gmail.com>
To: shuah <shuah@kernel.org>, Greg KH <gregkh@linuxfoundation.org>,
	Christoph Hellwig <hch@infradead.org>
Cc: valentina.manea.m@gmail.com, stern@rowland.harvard.edu,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 0/2] usbip: Implement SG support
Date: Fri, 16 Aug 2019 00:25:44 +0900
Message-ID: <20190815152544.GA4533@localhost.localdomain> (raw)
In-Reply-To: <0cf92881-53c7-09d4-18ac-593034a1a56c@kernel.org>

On Thu, Aug 15, 2019 at 08:10:49AM -0600, shuah wrote:
> On 8/15/19 7:23 AM, Greg KH wrote:
> > On Wed, Aug 14, 2019 at 06:19:51AM -0700, Christoph Hellwig wrote:
> > > 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.
> > 
> > I agree.  Let's wait for Christoph's series to be applied before taking
> > this one.
> > 
> 
> Great. Thanks you both looking at these. Makes sense.

Ok. Then I will drop the patch 1 and leave vhci flags without
including the HCD_DMA flag to skip dma mapping.

BTW, in my patch 2, I set URB_DMA_MAP_SG flag in
vhci_map_urb_for_dma() of patch 1 to tell the server to use SG.
I will fix it by setting URB_DMA_MAP_SG flag in other place and
resend v6. Is it ok?

Regards
Suwan Kim

      reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-08 15:54 Suwan Kim
2019-08-08 15:54 ` [PATCH v5 1/2] usbip: Skip DMA mapping and unmapping for urb at vhci Suwan Kim
2019-08-08 16:18   ` shuah
2019-08-13 18:34     ` shuah
2019-08-22 16:40   ` Greg KH
2019-08-22 22:19     ` Suwan Kim
2019-08-08 15:54 ` [PATCH v5 2/2] usbip: Implement SG support to vhci-hcd and stub driver Suwan Kim
2019-08-08 16:21   ` shuah
2019-08-13 18:36     ` shuah
2019-08-22  1:52     ` Suwan Kim
2019-08-14 13:19 ` [PATCH v5 0/2] usbip: Implement SG support Christoph Hellwig
2019-08-15 13:23   ` Greg KH
2019-08-15 14:10     ` shuah
2019-08-15 15:25       ` Suwan Kim [this message]

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