Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753143AbaBYJWH (ORCPT ); Tue, 25 Feb 2014 04:22:07 -0500 Received: from hqemgate15.nvidia.com ([216.228.121.64]:4469 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751000AbaBYJWE (ORCPT ); Tue, 25 Feb 2014 04:22:04 -0500 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Tue, 25 Feb 2014 01:19:28 -0800 Message-ID: <530C60A4.5040302@nvidia.com> Date: Tue, 25 Feb 2014 17:21:40 +0800 From: Wei Ni User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Guenter Roeck , "khali@linux-fr.org" CC: "lm-sensors@lm-sensors.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 1/2] hwmon: (lm90) split set&show temp as common codes References: <1393309301-28337-1-git-send-email-wni@nvidia.com> <1393309301-28337-2-git-send-email-wni@nvidia.com> <530C391B.5090206@roeck-us.net> <530C527F.1020806@nvidia.com> <530C5AE8.8010709@roeck-us.net> In-Reply-To: <530C5AE8.8010709@roeck-us.net> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/25/2014 04:57 PM, Guenter Roeck wrote: > On 02/25/2014 12:21 AM, Wei Ni wrote: >> On 02/25/2014 02:32 PM, Guenter Roeck wrote: >>> On 02/24/2014 10:21 PM, Wei Ni wrote: >>>> Split set&show temp codes as common functions, so we can use it >>>> directly when implement linux thermal framework. >>>> And handle error return value for the lm90_select_remote_channel >>>> and write_tempx, then set_temp8 and set_temp11 could return it >>>> to user-space. >>>> >>>> Signed-off-by: Wei Ni >>>> Signed-off-by: Jean Delvare >>>> --- >>>> drivers/hwmon/lm90.c | 170 ++++++++++++++++++++++++++++++++++---------------- >>>> 1 file changed, 115 insertions(+), 55 deletions(-) >>>> >>>> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c >>>> index c9ff08d..fb9e224 100644 >>>> --- a/drivers/hwmon/lm90.c >>>> +++ b/drivers/hwmon/lm90.c >>>> @@ -473,20 +473,29 @@ static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) >>>> * various registers have different meanings as a result of selecting a >>>> * non-default remote channel. >>>> */ >>>> -static inline void lm90_select_remote_channel(struct i2c_client *client, >>>> - struct lm90_data *data, >>>> - int channel) >>>> +static inline int lm90_select_remote_channel(struct i2c_client *client, >>>> + struct lm90_data *data, >>>> + int channel) >>>> { >>>> u8 config; >>>> + int err; >>>> >>>> if (data->kind == max6696) { >>>> lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); >>>> config &= ~0x08; >>>> if (channel) >>>> config |= 0x08; >>>> - i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, >>>> - config); >>>> + err = i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, >>>> + config); >>>> + if (err < 0) { >>>> + dev_err(&client->dev, >>>> + "Failed to select remote channel %d, err %d\n", >>>> + channel, err); >>>> + return err; >>> >>> Not my call to make, but I really dislike all that new noisiness. >>> Sure, it is ok to pass the error back, but in my opinion that is >>> good enough. If every driver in the kernel would be that noisy, >>> the log would be all but useless. >> >> This was discussed in https://lkml.org/lkml/2013/12/227 >> Jean wish to catch and return write errors,then the set_temp8() could >> return error to user-space. >> > > The link doesn't work for me. Anyway, catching write errors and being > noisy about it are different issues, and I am a bit surprised that > Jean wants the driver to be noisy about it, but if so I won't object. Sorry, the link should be https://lkml.org/lkml/2013/7/12/227 > > Guenter > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/