diff options
| author | Josh Boyer <jwboyer@fedoraproject.org> | 2016-03-28 09:22:14 -0400 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2016-03-29 15:39:36 +0200 |
| commit | ea36ae09105b7688225c02d33f1f3213299360f6 (patch) | |
| tree | 0f26b91db057dc2fcc58acbeb327398d7ed250c6 /drivers/hid | |
| parent | 972e6a993f278b416a8ee3ec65475724fc36feb2 (diff) | |
| download | lwn-ea36ae09105b7688225c02d33f1f3213299360f6.tar.gz lwn-ea36ae09105b7688225c02d33f1f3213299360f6.zip | |
HID: lenovo: Don't use stack variables for DMA buffers
The lenovo_send_cmd_cptkbd function uses a stack variable to submit
commands via hid_hw_raw_request. Eventually this gets to the
usb_hcd_map_urb_for_dma function, which causes a warning to be thrown
if the CONFIG_DMA_API_DEBUG option is enabled.
Fix this by allocating a temporary buffer instead.
[jkosina@suse.cz: no need to NULL-initialize buf, spotted by Benjamin]
Reported-by: lejeczek <peljasz@yahoo.co.uk>
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-lenovo.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c index 0125e356bd8d..1ac4ff4d57a6 100644 --- a/drivers/hid/hid-lenovo.c +++ b/drivers/hid/hid-lenovo.c @@ -184,21 +184,31 @@ static int lenovo_send_cmd_cptkbd(struct hid_device *hdev, unsigned char byte2, unsigned char byte3) { int ret; - unsigned char buf[] = {0x18, byte2, byte3}; + unsigned char *buf; + + buf = kzalloc(3, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = 0x18; + buf[1] = byte2; + buf[2] = byte3; switch (hdev->product) { case USB_DEVICE_ID_LENOVO_CUSBKBD: - ret = hid_hw_raw_request(hdev, 0x13, buf, sizeof(buf), + ret = hid_hw_raw_request(hdev, 0x13, buf, 3, HID_FEATURE_REPORT, HID_REQ_SET_REPORT); break; case USB_DEVICE_ID_LENOVO_CBTKBD: - ret = hid_hw_output_report(hdev, buf, sizeof(buf)); + ret = hid_hw_output_report(hdev, buf, 3); break; default: ret = -EINVAL; break; } + kfree(buf); + return ret < 0 ? ret : 0; /* BT returns 0, USB returns sizeof(buf) */ } |