From 061232f0d47fa10103f3efa3e890f002a930d902 Mon Sep 17 00:00:00 2001 From: Benjamin Tissoires Date: Mon, 21 Nov 2016 11:48:40 +0100 Subject: [PATCH] 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 Signed-off-by: Jiri Kosina --- drivers/hid/hid-lg.c | 14 ++++++++++---- 1 file 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) -- 2.20.1