From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Tissoires Subject: [PATCH 3/4] HID: magicmouse: make transfer buffers DMA capable Date: Mon, 21 Nov 2016 11:48:41 +0100 Message-ID: <1479725322-30863-4-git-send-email-benjamin.tissoires@redhat.com> References: <1479725322-30863-1-git-send-email-benjamin.tissoires@redhat.com> Return-path: In-Reply-To: <1479725322-30863-1-git-send-email-benjamin.tissoires@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Jiri Kosina Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-input@vger.kernel.org Kernel v4.9 strictly enforces DMA capable buffers, so we need to remove buffers allocated on the stack. Signed-off-by: Benjamin Tissoires --- drivers/hid/hid-magicmouse.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c index d6fa496..20b40ad 100644 --- 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; -- 2.7.4