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authorFlorian Mickler <florian@mickler.org>2011-03-21 15:33:44 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-05-20 09:27:58 -0300
commitb47b850116369a474f71c8ee1e7d06dfa9bf5468 (patch)
tree432c834753aec851234616c7467d920eca20c4c6 /drivers/media/dvb/dvb-usb
parent0e4e7208e6b33816c457292ee771da3a5779027b (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')
-rw-r--r--drivers/media/dvb/dvb-usb/dw2102.c10
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 f5b9da18f611..5aabfbcb545b 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;
}