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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 S966068AbeCSQHL (ORCPT ); Mon, 19 Mar 2018 12:07:11 -0400 Received: from mail-cys01nam02on0100.outbound.protection.outlook.com ([104.47.37.100]:20505 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966064AbeCSQHA (ORCPT ); Mon, 19 Mar 2018 12:07:00 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Dmitry Torokhov , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 024/167] Input: elan_i2c - check if device is there before really probing Thread-Topic: [PATCH AUTOSEL for 4.4 024/167] Input: elan_i2c - check if device is there before really probing Thread-Index: AQHTv5wmd4xxesW2mUu6M1lp8DkkUQ== Date: Mon, 19 Mar 2018 16:05:51 +0000 Message-ID: <20180319160513.16384-24-alexander.levin@microsoft.com> References: <20180319160513.16384-1-alexander.levin@microsoft.com> In-Reply-To: <20180319160513.16384-1-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;DM5PR2101MB1093;7:LBKnHHdjwb2kp9GJBChhziyLQMBfIxaaGzogfPHPp7rgd2yRl4rkrQfxWHFin954qkkJVK+6m0FB8QXlkCXxYLvqqVeqtPVnNShAIxvOs4ziFnEPF+GuP4aifikpHW7z6/+h91Jw1cHX1hS85sqyue50/RdeM+bhZfT/sytyOGrO1/NToKlBzOKepW3Cz48EW0eyJjCfSOGgq1AN8nzSgZvuXhdM5qTX2Rj6vTUBX3d1BmfTd5xKcqGTbegma7NN;20:rcgkvFEF+Mvu1iTfMUm0XbrTtSaHsSXzJSTrkAU7tK6G93kekI0BIRzydKOMPli9YADZWqaQujKb9QszA3xZWOTAf3nA1KaIkw4OVlerQmfX+UYfgS0XWLyBhZa3th80+H6lIWzC/4XvA/GBJkAwzi1A/W/N9LonjnD5GK164qY= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: ae62d326-5180-4f49-663f-08d58db36dea x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1093; 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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