diff options
| author | Florian Mickler <florian@mickler.org> | 2011-03-21 15:33:44 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-05-20 09:27:58 -0300 |
| commit | b47b850116369a474f71c8ee1e7d06dfa9bf5468 (patch) | |
| tree | 432c834753aec851234616c7467d920eca20c4c6 /drivers/media/dvb/dvb-usb/dw2102.c | |
| parent | 0e4e7208e6b33816c457292ee771da3a5779027b (diff) | |
[media] dw2102: get rid of on-stack dma buffer
usb_control_msg initiates (and waits for completion of) a dma transfer using
the supplied buffer. That buffer thus has to be seperately allocated on
the heap.
In lib/dma_debug.c the function check_for_stack even warns about it:
WARNING: at lib/dma-debug.c:866 check_for_stack
Note: This change is tested to compile only, as I don't have the hardware.
Signed-off-by: Florian Mickler <florian@mickler.org>
Cc: Igor M. Liplianin <liplianin@tut.by>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/dvb-usb/dw2102.c')
| -rw-r--r-- | drivers/media/dvb/dvb-usb/dw2102.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/media/dvb/dvb-usb/dw2102.c b/drivers/media/dvb/dvb-usb/dw2102.c index f5b9da18f61..5aabfbcb545 100644 --- a/drivers/media/dvb/dvb-usb/dw2102.c +++ b/drivers/media/dvb/dvb-usb/dw2102.c @@ -121,12 +121,16 @@ static int dw210x_op_rw(struct usb_device *dev, u8 request, u16 value, u16 index, u8 * data, u16 len, int flags) { int ret; - u8 u8buf[len]; - + u8 *u8buf; unsigned int pipe = (flags == DW210X_READ_MSG) ? usb_rcvctrlpipe(dev, 0) : usb_sndctrlpipe(dev, 0); u8 request_type = (flags == DW210X_READ_MSG) ? USB_DIR_IN : USB_DIR_OUT; + u8buf = kmalloc(len, GFP_KERNEL); + if (!u8buf) + return -ENOMEM; + + if (flags == DW210X_WRITE_MSG) memcpy(u8buf, data, len); ret = usb_control_msg(dev, pipe, request, request_type | USB_TYPE_VENDOR, @@ -134,6 +138,8 @@ static int dw210x_op_rw(struct usb_device *dev, u8 request, u16 value, if (flags == DW210X_READ_MSG) memcpy(data, u8buf, len); + + kfree(u8buf); return ret; } |