HID: lg: make transfer buffers DMA capable

Kernel v4.9 strictly enforces DMA capable buffers, so we need to remove
buffers allocated on the stack.

[jkosina@suse.cz: fix up second usage of hid_hw_raw_request(), spotted by
 0day build bot]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
index 76f644deb0a7..c5c5fbe9d605 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -756,11 +756,16 @@ static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
         /* Setup wireless link with Logitech Wii wheel */
         if (hdev->product == USB_DEVICE_ID_LOGITECH_WII_WHEEL) {
-                unsigned char buf[] = { 0x00, 0xAF,  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+                const unsigned char cbuf[] = { 0x00, 0xAF,  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+                u8 *buf = kmemdup(cbuf, sizeof(cbuf), GFP_KERNEL);
 
-                ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(buf),
-                                        HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+                if (!buf) {
+                        ret = -ENOMEM;
+                        goto err_free;
+                }
 
+                ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
+                                        HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
                 if (ret >= 0) {
                         /* insert a little delay of 10 jiffies ~ 40ms */
                         wait_queue_head_t wait;
@@ -772,9 +777,10 @@ static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id)
                         buf[1] = 0xB2;
                         get_random_bytes(&buf[2], 2);
 
-                        ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(buf),
+                        ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
                                         HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
                 }
+                kfree(buf);
         }
 
         if (drv_data->quirks & LG_FF)