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[media] s2255drv: don't use stack for DMA

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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.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-10-10 11:11:13 -03:00 committed by Mauro Carvalho Chehab
parent 45ae4a5220
commit db65c49e44
1 changed files with 13 additions and 2 deletions
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15
drivers/media/usb/s2255/s2255drv.c
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@ -1901,19 +1901,30 @@ static long s2255_vendor_req(struct s2255_dev *dev, unsigned char Request,
s32 TransferBufferLength, int bOut)
{
int r;
unsigned char *buf;
buf = kmalloc(TransferBufferLength, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (!bOut) {
r = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
Request,
USB_TYPE_VENDOR | USB_RECIP_DEVICE |
USB_DIR_IN,
Value, Index, TransferBuffer,
Value, Index, buf,
TransferBufferLength, HZ * 5);
if (r >= 0)
memcpy(TransferBuffer, buf, TransferBufferLength);
} else {
memcpy(buf, TransferBuffer, TransferBufferLength);
r = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
Request, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
Value, Index, TransferBuffer,
Value, Index, buf,
TransferBufferLength, HZ * 5);
}
kfree(buf);
return r;
}