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Sat, 3 Mar 2018 17:24:12 -0500 Received: from mail-co1nam03on0138.outbound.protection.outlook.com ([104.47.40.138]:57624 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752205AbeCCWYL (ORCPT ); Sat, 3 Mar 2018 17:24:11 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Dan Carpenter , Eric Anholt , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 001/102] drm/panel: rpi-touchscreen: propagate errors in rpi_touchscreen_i2c_read() Thread-Topic: [PATCH AUTOSEL for 4.15 001/102] drm/panel: rpi-touchscreen: propagate errors in rpi_touchscreen_i2c_read() Thread-Index: AQHTsz5ZOPse6B2JyUyiSVCOfTbF5w== Date: Sat, 3 Mar 2018 22:24:08 +0000 Message-ID: <20180303222318.26006-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MW2PR2101MB1036;6:/KbBN7f5EEURV10p/jX93uHFbyFvP6PhIh5qgi7LYZ/PtUEn3wAKHGvTKxteyWOEoPY2P+XStU8gxNsdSii3EU2b1JJdXBKzcdKJnS+ntBUDRkIV4XCdnG+kX115l6BpzS82rqxHKwAevSOIC+TfhNH8284KwdsJrtt8PVHk1MMRJobUS9TrdJSgTyJtb7AIGRfTah2y3S13y7lXS8QA/UClBxTEW/5MG5hHOJOi5cgTWhC/bNz1zyfkwvxFS4NvmgtfYApkO6KU1SpPsd9+YlOdZMm0OwW4ljtjirqJ/iQAT7AIAGMt7kt3QDnRj+7jx3HPRDp2aNso/7T5uSNBxBEXSVKMUjk7qtzaQP/Xl/CDMCMGvIeoR3nfJeiU+8Yk;5:rYsduDAVOXxeU2uqRTqKvUecfFtIMh8fV09UA9FWsZymW4jN96mTiC+qdC1YCC+4cFdkemAPv+mbb4QFT/yhpXKCNv/umJ/JkdrYymJ0T4HmoonYeY+OGUPxk0nabMJGKrfUReDDZgxrDBb7GdBRBrCbayF127x4TCrLaXg+h7k=;24:2mA1uXljRWwVAOWwjHcpOc4HsIjy/llagX65eX1wMe661Y+miuS//ROqBk6E9WlLreP9OGO7Th7BAQAQ6lrL5HuvhURaIQTzgf4BFZOT/Ng=;7:Oek3hLKniKY2KtrqqplVCFqk9eZrjqYDL6jkwgc7DUlvWzigcPOlEoI9Ab++UNWXPwg87c1WkC84pEGSNfM2eTAUBtzAut/GBlabf9fUopBLz3xhaFf1jIgCHkuN04AbAKW30V/FG93JHv8DLGK2JOZiALi9sQsxMOOkVH6FmocbCatljwWdqx3vRsDSkLQPiiSw16YQNDCNM5B5jcEGAe84ZaFCLxsibiYc/tGmN+097aXyb+CkTgXVtTNm1qm8 x-ms-exchange-antispam-srfa-diagnostics: SOS; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 571b3c06-81e5-4661-e5ee-08d581557bb1 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:24:08.8221 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1036 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Dan Carpenter [ Upstream commit 85b4587f8e94143bafb8b6a4003a5187b9a8753d ] There is one caller which checks whether rpi_touchscreen_i2c_read() returns negative error codes. Currently it can't because negative error codes are truncated to u8, but that's easy to fix if we change the type to int. Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchs= creen.") Signed-off-by: Dan Carpenter Signed-off-by: Eric Anholt Link: https://patchwork.freedesktop.org/patch/msgid/20171020002845.kar2wg7g= qxg7tzqi@mwanda Reviewed-by: Eric Anholt Signed-off-by: Sasha Levin --- drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/driver= s/gpu/drm/panel/panel-raspberrypi-touchscreen.c index 890fd6ff397c..d964d454e4ae 100644 --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c @@ -221,7 +221,7 @@ static struct rpi_touchscreen *panel_to_ts(struct drm_p= anel *panel) return container_of(panel, struct rpi_touchscreen, base); } =20 -static u8 rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg) +static int rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg) { return i2c_smbus_read_byte_data(ts->i2c, reg); } --=20 2.14.1