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
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