From: Dave Airlie <airlied@xxxxxxxxxx>
Thou shall not send control msg from the stack,
does that mean I can send it from the RO memory area?
and it looks like the answer is no, so here's
v2 which kmemdups.
Reported-by: poma
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
---
drivers/gpu/drm/udl/udl_main.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 29f0207..873f010 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -98,17 +98,23 @@ static int udl_parse_vendor_descriptor(struct drm_device *dev,
static int udl_select_std_channel(struct udl_device *udl)
{
int ret;
- u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
- 0x1C, 0x88, 0x5E, 0x15,
- 0x60, 0xFE, 0xC6, 0x97,
- 0x16, 0x3D, 0x47, 0xF2};
+ static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
+ 0x1C, 0x88, 0x5E, 0x15,
+ 0x60, 0xFE, 0xC6, 0x97,
+ 0x16, 0x3D, 0x47, 0xF2};
+ void *sendbuf;
+
+ sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
+ if (!sendbuf)
+ return -ENOMEM;
ret = usb_control_msg(udl->udev,
usb_sndctrlpipe(udl->udev, 0),
NR_USB_REQUEST_CHANNEL,
(USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
- set_def_chn, sizeof(set_def_chn),
+ sendbuf, sizeof(set_def_chn),
USB_CTRL_SET_TIMEOUT);
+ kfree(sendbuf);
return ret < 0 ? ret : 0;
}
--
2.5.5
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