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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Gustavo Pimentel <Gustavo.Pimentel@synopsys.com>
Cc: linux-doc@vger.kernel.org, linux-pci@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 10:30:16 +0100	[thread overview]
Message-ID: <YCT5KDnAWex8fvbz@kroah.com> (raw)
In-Reply-To: <02835da8fc8c9293fecbe666a8db3fb79276fdde.1613034397.git.gustavo.pimentel@synopsys.com>

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.

Same for the other sysfs file.

And why do you need a lock for this show function?

thanks,

greg k-h

  reply	other threads:[~2021-02-11  9:35 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 " Gustavo Pimentel
2021-02-11  9:08 ` [PATCH v5 1/6] misc: " Gustavo Pimentel
2021-02-11  9:30   ` Greg Kroah-Hartman [this message]
2021-02-11  9:50     ` Gustavo Pimentel
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

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