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[media] siano: make it work again with CONFIG_VMAP_STACK

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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

Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-02-14 17:47:57 -02:00
parent 42980da2eb
commit f9c85ee671
1 changed files with 13 additions and 5 deletions
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18
drivers/media/usb/siano/smsusb.c
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@ -218,22 +218,30 @@ static int smsusb_start_streaming(struct smsusb_device_t *dev)
static int smsusb_sendrequest(void *context, void *buffer, size_t size)
{
struct smsusb_device_t *dev = (struct smsusb_device_t *) context;
struct sms_msg_hdr *phdr = (struct sms_msg_hdr *) buffer;
int dummy;
struct sms_msg_hdr *phdr;
int dummy, ret;
if (dev->state != SMSUSB_ACTIVE) {
pr_debug("Device not active yet\n");
return -ENOENT;
}
phdr = kmalloc(size, GFP_KERNEL);
if (!phdr)
return -ENOMEM;
memcpy(phdr, buffer, size);
pr_debug("sending %s(%d) size: %d\n",
smscore_translate_msg(phdr->msg_type), phdr->msg_type,
phdr->msg_length);
smsendian_handle_tx_message((struct sms_msg_data *) phdr);
smsendian_handle_message_header((struct sms_msg_hdr *)buffer);
return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
buffer, size, &dummy, 1000);
smsendian_handle_message_header((struct sms_msg_hdr *)phdr);
ret = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
phdr, size, &dummy, 1000);
kfree(phdr);
return ret;
}
static char *smsusb1_fw_lkup[] = {