HID: rmi: make transfer buffers DMA capable

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

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 9cd2ca34a6be..be89bcbf6a71 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -188,10 +188,16 @@ static int rmi_set_page(struct hid_device *hdev, u8 page)
 static int rmi_set_mode(struct hid_device *hdev, u8 mode)
 {
         int ret;
-        u8 txbuf[2] = {RMI_SET_RMI_MODE_REPORT_ID, mode};
+        const u8 txbuf[2] = {RMI_SET_RMI_MODE_REPORT_ID, mode};
+        u8 *buf;
 
-        ret = hid_hw_raw_request(hdev, RMI_SET_RMI_MODE_REPORT_ID, txbuf,
+        buf = kmemdup(txbuf, sizeof(txbuf), GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        ret = hid_hw_raw_request(hdev, RMI_SET_RMI_MODE_REPORT_ID, buf,
                         sizeof(txbuf), HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+        kfree(buf);
         if (ret < 0) {
                 dev_err(&hdev->dev, "unable to set rmi mode to %d (%d)\n", mode,
                         ret);