HID: magicmouse: 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>

diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index d6fa496..20b40ad 100644 (file)
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -493,7 +493,8 @@ static int magicmouse_input_configured(struct hid_device *hdev,
 static int magicmouse_probe(struct hid_device *hdev,
        const struct hid_device_id *id)
 {
-       __u8 feature[] = { 0xd7, 0x01 };
+       const u8 feature[] = { 0xd7, 0x01 };
+       u8 *buf;
        struct magicmouse_sc *msc;
        struct hid_report *report;
        int ret;
@@ -544,6 +545,12 @@ static int magicmouse_probe(struct hid_device *hdev,
        }
        report->size = 6;
 
+       buf = kmemdup(feature, sizeof(feature), GFP_KERNEL);
+       if (!buf) {
+               ret = -ENOMEM;
+               goto err_stop_hw;
+       }
+
        /*
         * Some devices repond with 'invalid report id' when feature
         * report switching it into multitouch mode is sent to it.
@@ -552,8 +559,9 @@ static int magicmouse_probe(struct hid_device *hdev,
         * but there seems to be no other way of switching the mode.
         * Thus the super-ugly hacky success check below.
         */
-       ret = hid_hw_raw_request(hdev, feature[0], feature, sizeof(feature),
+       ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(feature),
                                HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+       kfree(buf);
        if (ret != -EIO && ret != sizeof(feature)) {
                hid_err(hdev, "unable to request touch data (%d)\n", ret);
                goto err_stop_hw;