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staging: most: prevent DMA on stack

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This patch is needed to avoid having DMA on the stack.

Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2015-09-28 17:18:43 +02:00 committed by Greg Kroah-Hartman
parent cc8d993513
commit 2637022887
1 changed files with 16 additions and 10 deletions
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26
drivers/staging/most/hdm-usb/hdm_usb.c
View file

@ -146,17 +146,23 @@ static void wq_netinfo(struct work_struct *wq_obj);
*
* This is reads data from INIC's direct register communication interface
*/
static inline int drci_rd_reg(struct usb_device *dev, u16 reg, void *buf)
static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
{
return usb_control_msg(dev,
usb_rcvctrlpipe(dev, 0),
DRCI_READ_REQ,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000,
reg,
buf,
2,
5 * HZ);
int retval;
u16 *dma_buf = kzalloc(sizeof(u16), GFP_KERNEL);
u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
if (!dma_buf)
return -ENOMEM;
retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
DRCI_READ_REQ, req_type,
0x0000,
reg, dma_buf, sizeof(u16), 5 * HZ);
*buf = *dma_buf;
kfree(dma_buf);
return retval;
}
/**