siano: make it work again with CONFIG_VMAP_STACK

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commit f9c85ee671 upstream.

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
on x86 architecture. On other architectures, this has been a
requirement since Kernel 2.2. So, after this patch, this driver
should likely work fine on all archs.

Tested with USB ID 2040:5510: Hauppauge Windham

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Mauro Carvalho Chehab 2017-02-14 17:47:57 -02:00 • committed by Ben Hutchings

parent bf7916239a

commit 6ef068c8a3

1 changed files with 13 additions and 5 deletions

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18

drivers/media/usb/siano/smsusb.c

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