From: Gustavo Pimentel <Gustavo.Pimentel@synopsys.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Derek Kiernan <derek.kiernan@xilinx.com>,
Dragan Cvetic <dragan.cvetic@xilinx.com>,
Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
Bjorn Helgaas <bhelgaas@google.com>
Subject: RE: [PATCH v5 1/6] misc: Add Synopsys DesignWare xData IP driver
Date: Thu, 11 Feb 2021 09:50:33 +0000 [thread overview]
Message-ID: <DM5PR12MB1835A23E60363C730E4D69AFDA8C9@DM5PR12MB1835.namprd12.prod.outlook.com> (raw)
In-Reply-To: <YCT5KDnAWex8fvbz@kroah.com>
On Thu, Feb 11, 2021 at 9:30:16, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Thu, Feb 11, 2021 at 10:08:38AM +0100, Gustavo Pimentel wrote:
> > +static ssize_t write_show(struct device *dev, struct device_attribute *attr,
> > + char *buf)
> > +{
> > + struct pci_dev *pdev = to_pci_dev(dev);
> > + struct dw_xdata *dw = pci_get_drvdata(pdev);
> > + u64 rate;
> > +
> > + mutex_lock(&dw->mutex);
> > + dw_xdata_perf(dw, &rate, true);
> > + mutex_unlock(&dw->mutex);
> > +
> > + return sysfs_emit(buf, "%llu MB/s\n", rate);
>
> Do not put units in a sysfs file, that should be in the documentation,
> otherwise this forces userspace to "parse" the units which is a mess.
Okay.
>
> Same for the other sysfs file.
>
> And why do you need a lock for this show function?
Maybe I understood it wrongly, please correct me in that case. The
dw_xdata_perf() is called on the write_show() and read_show(), to avoid a
possible race condition between those calls, I have added this mutex.
Thanks.
-Gustavo
>
> thanks,
>
> greg k-h
next prev parent reply other threads:[~2021-02-11 9:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 9:08 [PATCH v5 0/6] misc: Add Add Synopsys DesignWare xData IP driver Gustavo Pimentel
2021-02-11 9:08 ` [PATCH v5 1/6] misc: " Gustavo Pimentel
2021-02-11 9:30 ` Greg Kroah-Hartman
2021-02-11 9:50 ` Gustavo Pimentel [this message]
2021-02-11 9:59 ` Greg Kroah-Hartman
2021-02-11 10:21 ` Gustavo Pimentel
2021-02-11 10:33 ` Greg Kroah-Hartman
2021-02-11 10:51 ` Gustavo Pimentel
2021-02-11 11:42 ` Leon Romanovsky
2021-02-11 12:32 ` Greg Kroah-Hartman
2021-02-11 13:50 ` Leon Romanovsky
2021-02-11 14:02 ` Greg Kroah-Hartman
2021-02-11 14:13 ` Leon Romanovsky
2021-02-11 9:08 ` [PATCH v5 2/6] misc: Add Synopsys DesignWare xData IP driver to Makefile Gustavo Pimentel
2021-02-11 9:28 ` Greg Kroah-Hartman
2021-02-11 9:40 ` Gustavo Pimentel
2021-02-11 9:08 ` [PATCH v5 3/6] misc: Add Synopsys DesignWare xData IP driver to Kconfig Gustavo Pimentel
2021-02-11 11:29 ` Krzysztof Wilczyński
2021-02-11 13:33 ` Gustavo Pimentel
2021-02-11 9:08 ` [PATCH v5 4/6] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver Gustavo Pimentel
2021-02-11 9:08 ` [PATCH v5 5/6] MAINTAINERS: Add Synopsys xData IP driver maintainer Gustavo Pimentel
2021-02-11 9:08 ` [PATCH v5 6/6] docs: ABI: Add sysfs documentation interface of dw-xdata-pcie driver Gustavo Pimentel
2021-02-11 9:29 ` Leon Romanovsky
2021-02-11 9:36 ` Greg Kroah-Hartman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=DM5PR12MB1835A23E60363C730E4D69AFDA8C9@DM5PR12MB1835.namprd12.prod.outlook.com \
--to=gustavo.pimentel@synopsys.com \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=bhelgaas@google.com \
--cc=corbet@lwn.net \
--cc=derek.kiernan@xilinx.com \
--cc=dragan.cvetic@xilinx.com \
--cc=gregkh@linuxfoundation.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).