linux-kernel - Re: [PATCH 3/3] bus: mhi: replace snprintf in show functions with sysfs

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Message-ID: <6ddc01b24b1c72f7e92174a037043b5cfffa3431.camel@perches.com>
Date:   Sat, 16 Oct 2021 03:24:17 -0700
From:   Joe Perches <joe@...ches.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     hemantk@...eaurora.org, bbhatt@...eaurora.org,
        loic.poulain@...aro.org, wangqing@...o.com, mhi@...ts.linux.dev,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <mani@...nel.org>
Subject: Re: [PATCH 3/3] bus: mhi: replace snprintf in show functions with
 sysfs_emit

On Sat, 2021-10-16 at 09:37 +0200, Greg KH wrote:
> On Sat, Oct 16, 2021 at 12:27:34PM +0530, Manivannan Sadhasivam wrote:
> > From: Qing Wang <wangqing@...o.com>
> > coccicheck complains about the use of snprintf() in sysfs show functions.
[]
> > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
[]
> > @@ -94,7 +94,7 @@ static ssize_t serial_number_show(struct device *dev,
> >  	struct mhi_device *mhi_dev = to_mhi_device(dev);
> >  	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
> >  
> > -	return snprintf(buf, PAGE_SIZE, "Serial Number: %u\n",
> > +	return sysfs_emit(buf, "Serial Number: %u\n",
> >  			mhi_cntrl->serial_number);
> 
> The text "Serial Number: " should not be in here, right?  It's obvious
> this is a serial number, that's what the documentation and file name
> says.  Userspace should not have to parse sysfs files.

sysfs is ABI right?  Parsing or not, it's what's already there.