Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

net/usb/r815x: replace USB buffer from stack to DMA-able

Browse source 
Some USB buffers use stack which may not be DMA-able.
Use the buffers from kmalloc to replace those one.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
hayeswang 2013-07-31 17:21:22 +08:00 committed by David S. Miller
parent 06693f305e
commit b2f47377e8
1 changed files with 27 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

44
drivers/net/usb/r815x.c
View file

@ -24,34 +24,43 @@
static int pla_read_word(struct usb_device *udev, u16 index)
{
int data, ret;
int ret;
u8 shift = index & 2;
__le32 ocp_data;
__le32 *tmp;
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return -ENOMEM;
index &= ~3;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
RTL815x_REQ_GET_REGS, RTL815x_REQT_READ,
index, MCU_TYPE_PLA, &ocp_data, sizeof(ocp_data),
500);
index, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500);
if (ret < 0)
return ret;
goto out2;
data = __le32_to_cpu(ocp_data);
data >>= (shift * 8);
data &= 0xffff;
ret = __le32_to_cpu(*tmp);
ret >>= (shift * 8);
ret &= 0xffff;
return data;
out2:
kfree(tmp);
return ret;
}
static int pla_write_word(struct usb_device *udev, u16 index, u32 data)
{
__le32 ocp_data;
__le32 *tmp;
u32 mask = 0xffff;
u16 byen = BYTE_EN_WORD;
u8 shift = index & 2;
int ret;
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return -ENOMEM;
data &= mask;
if (shift) {
@ -63,19 +72,20 @@ static int pla_write_word(struct usb_device *udev, u16 index, u32 data)
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
RTL815x_REQ_GET_REGS, RTL815x_REQT_READ,
index, MCU_TYPE_PLA, &ocp_data, sizeof(ocp_data),
500);
index, MCU_TYPE_PLA, tmp, sizeof(*tmp), 500);
if (ret < 0)
return ret;
goto out3;
data |= __le32_to_cpu(ocp_data) & ~mask;
ocp_data = __cpu_to_le32(data);
data |= __le32_to_cpu(*tmp) & ~mask;
*tmp = __cpu_to_le32(data);
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
RTL815x_REQ_SET_REGS, RTL815x_REQT_WRITE,
index, MCU_TYPE_PLA | byen, &ocp_data,
sizeof(ocp_data), 500);
index, MCU_TYPE_PLA | byen, tmp, sizeof(*tmp),
500);
out3:
kfree(tmp);
return ret;
}