From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755445AbdLGPrD (ORCPT ); Thu, 7 Dec 2017 10:47:03 -0500 Received: from omzsmtpe02.verizonbusiness.com ([199.249.25.209]:1026 "EHLO omzsmtpe02.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755405AbdLGPq5 (ORCPT ); Thu, 7 Dec 2017 10:46:57 -0500 From: alexander.levin@verizon.com Cc: Adam Sampson , Hans Verkuil , "Mauro Carvalho Chehab" , alexander.levin@verizon.com X-Host: surveyor.tdc.vzwcorp.com To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: [PATCH AUTOSEL for 4.14 056/135] media: usbtv: fix brightness and contrast controls Thread-Topic: [PATCH AUTOSEL for 4.14 056/135] media: usbtv: fix brightness and contrast controls Thread-Index: AQHTb3Jxu0lAiO2psECoZ9x972iGmQ== Date: Thu, 7 Dec 2017 15:45:43 +0000 Message-ID: <20171207154513.4154-56-alexander.levin@verizon.com> References: <20171207154513.4154-1-alexander.levin@verizon.com> In-Reply-To: <20171207154513.4154-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id vB7Fl9eh023938 From: Adam Sampson [ Upstream commit b3168c87c0492661badc3e908f977d79e7738a41 ] Because the brightness and contrast controls share a register, usbtv_s_ctrl needs to read the existing values for both controls before inserting the new value. However, the code accidentally wrote to the registers (from an uninitialised stack array), rather than reading them. The user-visible effect of this was that adjusting the brightness would also set the contrast to a random value, and vice versa -- so it wasn't possible to correctly adjust the brightness of usbtv's video output. Tested with an "EasyDAY" UTV007 device. Fixes: c53a846c48f2 ("usbtv: add video controls") Signed-off-by: Adam Sampson Reviewed-by: Lubomir Rintel Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/usbtv/usbtv-video.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c index 95b5f4319ec2..3668a04359e8 100644 --- a/drivers/media/usb/usbtv/usbtv-video.c +++ b/drivers/media/usb/usbtv/usbtv-video.c @@ -718,8 +718,8 @@ static int usbtv_s_ctrl(struct v4l2_ctrl *ctrl) */ if (ctrl->id == V4L2_CID_BRIGHTNESS || ctrl->id == V4L2_CID_CONTRAST) { ret = usb_control_msg(usbtv->udev, - usb_sndctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG, - USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + usb_rcvctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG, + USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 0, USBTV_BASE + 0x0244, (void *)data, 3, 0); if (ret < 0) goto error; -- 2.11.0