From: Florian Mickler Date: Mon, 21 Mar 2011 18:33:44 +0000 (-0300) Subject: [media] dw2102: get rid of on-stack dma buffer X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b47b850116369a474f71c8ee1e7d06dfa9bf5468;p=linux-beck.git [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 Cc: Igor M. Liplianin Signed-off-by: Mauro Carvalho Chehab --- 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; }