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Thu, 28 May 2020 16:50:12 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id A06C6C433CA; Thu, 28 May 2020 16:50:12 +0000 (UTC) Received: from [192.168.1.102] (unknown [157.47.99.82]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jprakash) by smtp.codeaurora.org (Postfix) with ESMTPSA id 54FB0C433C9; Thu, 28 May 2020 16:50:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 54FB0C433C9 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=jprakash@codeaurora.org Subject: Re: [PATCH V5 5/5] iio: adc: Clean up ADC code common to PMIC5 and PMIC7 To: Jonathan Cameron Cc: agross@kernel.org, bjorn.andersson@linaro.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mka@chromium.org, linus.walleij@linaro.org, Jonathan.Cameron@huawei.com, andy.shevchenko@gmail.com, amit.kucheria@verdurent.com, smohanad@codeaurora.org, kgunda@codeaurora.org, aghayal@codeaurora.org, Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-arm-msm@vger.kernel.org, linux-iio@vger.kernel.org, linux-arm-msm-owner@vger.kernel.org References: <1590157452-27179-1-git-send-email-jprakash@codeaurora.org> <1590157452-27179-6-git-send-email-jprakash@codeaurora.org> <20200524130440.250edb2e@archlinux> From: Jishnu Prakash Message-ID: <0078a610-fed8-7a18-ecd1-27b8eb5a8feb@codeaurora.org> Date: Thu, 28 May 2020 22:20:02 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200524130440.250edb2e@archlinux> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Hi Jonathan, On 5/24/2020 5:34 PM, Jonathan Cameron wrote: > On Fri, 22 May 2020 19:54:12 +0530 > Jishnu Prakash wrote: > >> This commit includes the following changes: >> >> Add a common function used for read_raw callback for both PMIC5 >> and PMIC7 ADCs. >> >> Add exit function for ADC. > Hi Jishnu, > > I don't understand why one is needed, and if it is you can't do > what you have here without introducing some nasty races. > So if you need it clearly explain why in comments in the code > and also consider how it may race with new requests coming in etc > as the userspace interfaces are still visible. > > Move the eoc_irq addition to the structure here as well as makes > no sense in earlier patch. > > Thanks, > > Jonathan > > >> Add info_property under adc_data to more efficiently distinguish >> PMIC5 and PMIC7 ADCs. >> >> Signed-off-by: Jishnu Prakash >> --- >> drivers/iio/adc/qcom-spmi-adc5.c | 81 +++++++++++++++++++++----------------- >> drivers/iio/adc/qcom-vadc-common.h | 1 + >> 2 files changed, 46 insertions(+), 36 deletions(-) >> >> >> +static int adc5_exit(struct platform_device *pdev) >> +{ >> + struct adc5_chip *adc = platform_get_drvdata(pdev); >> + >> + if (adc->irq_eoc >= 0) >> + disable_irq(adc->irq_eoc); > So here you are disabling an irq? Why. We should be removing it > cleanly in the managed flow shortly anyway. If you did do this > here for some reason I'm not thinking of then you would have > a race against the userspace being removed on the unwind > of the iio device register. > >> + return 0; >> +} >> + You're right about the exit function, the actions done in it are not strictly required, so I'll remove it in the next post.