From: Greg KH <gregkh@linuxfoundation.org>
To: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>,
Mauro Carvalho Chehab <mchehab@infradead.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
stable@vger.kernel.org, #@smtp.w2.samsung.com,
For@smtp.w2.samsung.com, 4.9+@smtp.w2.samsung.com
Subject: Re: [PATCH] siano: make it work again with CONFIG_VMAP_STACK
Date: Tue, 14 Feb 2017 11:41:46 -0800 [thread overview]
Message-ID: <20170214194146.GA28566@kroah.com> (raw)
In-Reply-To: <08f1b470a156163cc3394f73bcbaea3925b6f376.1487100723.git.mchehab@s-opensource.com>
On Tue, Feb 14, 2017 at 05:32:11PM -0200, Mauro Carvalho Chehab wrote:
> Reported as a Kaffeine bug:
> https://bugs.kde.org/show_bug.cgi?id=375811
>
> The USB control messages require DMA to work. We cannot pass
> a stack-allocated buffer, as it is not warranted that the
> stack would be into a DMA enabled area.
>
> On Kernel 4.9, the default is to not accept DMA on stack anymore.
>
> Tested with USB ID 2040:5510: Hauppauge Windham
>
> Cc: stable@vger.kernel.org # For 4.9+
Unless there is some major reason, this should go into _all_ stable
releases, as the driver would be broken on them all for platforms that
can't handle USB data that is not DMA-able. This has been a requirement
for USB drivers since the 2.2 days.
thanks,
greg k-h
next prev parent reply other threads:[~2017-02-14 19:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-14 19:32 [PATCH] siano: make it work again with CONFIG_VMAP_STACK Mauro Carvalho Chehab
2017-02-14 19:41 ` Greg KH [this message]
2017-02-14 19:45 ` Mauro Carvalho Chehab
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170214194146.GA28566@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=#@smtp.w2.samsung.com \
--cc=4.9+@smtp.w2.samsung.com \
--cc=For@smtp.w2.samsung.com \
--cc=linux-media@vger.kernel.org \
--cc=mchehab@infradead.org \
--cc=mchehab@kernel.org \
--cc=mchehab@s-opensource.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.