diff options
| author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-10-10 17:11:13 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-10-14 18:52:28 +0300 |
| commit | db65c49e442cf9c9d9dc950f67daf109609f982a (patch) | |
| tree | dbe7d1944232777e1533e43fbc475a3c17f4634d /drivers/media | |
| parent | 45ae4a5220a43ae79dacb69054a2c7928dd91c94 (diff) | |
| download | linux-db65c49e442cf9c9d9dc950f67daf109609f982a.tar.xz | |
[media] s2255drv: don't use stack for DMA
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>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/s2255/s2255drv.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/media/usb/s2255/s2255drv.c b/drivers/media/usb/s2255/s2255drv.c index c3a0e87066eb..f7bb78c1873c 100644 --- a/drivers/media/usb/s2255/s2255drv.c +++ b/drivers/media/usb/s2255/s2255drv.c @@ -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; } |