From: Alan Stern <stern@rowland.harvard.edu>
To: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
Hans de Goede <hdegoede@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: Why no SG support for isoc
Date: Tue, 7 Dec 2021 21:52:29 -0500 [thread overview]
Message-ID: <YbAd7eLQZVxptLDN@rowland.harvard.edu> (raw)
In-Reply-To: <e58d3323-eb21-5c59-daa8-230b91082748@synopsys.com>
On Tue, Dec 07, 2021 at 10:24:41PM +0000, Thinh Nguyen wrote:
> Hi,
>
> I came across this change fe2072cc1768 ("usb/hcd: Ensure scatter-gather
> is not used for isoc transfers") and wonder why it was made. The
> description doesn't explain much. I was trying to look for the archived
> conversation about this but couldn't find it.
>
> Can someone help explain why we enforce this to all hosts? Or help point
> to the archived conversation with the full explanation?
I don't remember the details; it was nine years ago. However, you can find the
email thread for the original patch submission here:
https://marc.info/?t=134122051600006&r=1&w=2
The discussion leading up to it apparently started here:
https://marc.info/?l=linux-usb&m=134098509628768&w=2
Alan Stern
next prev parent reply other threads:[~2021-12-08 2:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 22:24 Why no SG support for isoc Thinh Nguyen
2021-12-08 2:52 ` Alan Stern [this message]
2021-12-08 3:32 ` Thinh Nguyen
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