This patch is needed to avoid having DMA on the stack.
Signed-off-by: Andrey Shvetsov <andrey.shvetsov@xxxxxx>
Signed-off-by: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
---
drivers/staging/most/hdm-usb/hdm_usb.c | 26 ++++++++++++++++----------
1 file changed, 16 insertions(+), 10 deletions(-)
diff --git a/drivers/staging/most/hdm-usb/hdm_usb.c b/drivers/staging/most/hdm-usb/hdm_usb.c
index 01ea91b..7722212 100644
--- a/drivers/staging/most/hdm-usb/hdm_usb.c
+++ b/drivers/staging/most/hdm-usb/hdm_usb.c
@@ -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;
}
/**
--
1.7.9.5
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