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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965017AbeCSVlO (ORCPT ); Mon, 19 Mar 2018 17:41:14 -0400 Received: from mail-by2nam01on0118.outbound.protection.outlook.com ([104.47.34.118]:14025 "EHLO NAM01-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934719AbeCSP7A (ORCPT ); Mon, 19 Mar 2018 11:59:00 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Dmitry Torokhov , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 033/281] Input: elan_i2c - check if device is there before really probing Thread-Topic: [PATCH AUTOSEL for 4.9 033/281] Input: elan_i2c - check if device is there before really probing Thread-Index: AQHTv5sfx2WzBfnQ4EyT7VpBL7JM6Q== Date: Mon, 19 Mar 2018 15:58:29 +0000 Message-ID: <20180319155742.13731-33-alexander.levin@microsoft.com> References: <20180319155742.13731-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155742.13731-1-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;DM5PR2101MB0726;7:oJIHxTyb0kN3ES9wXSHbJ/1gHXVq4Jm7ZOR7S0dPL8oWPsL+X51lRTTNFkdtTQfBYZg/T091NbfFN8xQlpNO8geCu9Hll22XmPZxBRoZIsaZuaF6mY1dag0A/KU8lS+sfurOzsdesm6bjHZ1R4ssLLccyKzxKGP8aIpMf5QKWHXkevjjIZhYOnbiB94D9aKieJAM8+dsbD4TqLFgvYAh1FnZObvb9wDfjZETJI8dF4JixNDwdkDbhJzC2JsitiwM;20:gD40py0+i/xocUqFf1+YEf+JZtTF/BpVDB5RV3OGWTKUKdDAGDtmfmCWNt02HWI4upT7UMfTCzDWtER75KCbmX2CX7MbtwmsjzHk3rBlYDLm+Ian6rTobQbxoxD9kQXXzNwKNcUw7YaUaIr8eji9LOX+ZgoFT1yJgceY/pRKVPU= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 0429e8f5-c7c5-4a2f-b1fa-08d58db253b5 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0726; 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If we get error, fail silently with -ENXIO. Reviewed-by: Guenter Roeck Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/mouse/elan_i2c_core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan= _i2c_core.c index c9d491bc85e0..3851d5715772 100644 --- a/drivers/input/mouse/elan_i2c_core.c +++ b/drivers/input/mouse/elan_i2c_core.c @@ -1082,6 +1082,13 @@ static int elan_probe(struct i2c_client *client, return error; } =20 + /* Make sure there is something at this address */ + error =3D i2c_smbus_read_byte(client); + if (error < 0) { + dev_dbg(&client->dev, "nothing at this address: %d\n", error); + return -ENXIO; + } + /* Initialize the touchpad. */ error =3D elan_initialize(data); if (error) --=20 2.14.1