linux-kernel - Re: [PATCHv3 1/1] [RFC] uartclk from serial

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Message-ID: <CAEB7QLBEdNArtKz9zP7R4Za54049jJqCEqhPvE6rS59j1tD0PQ@mail.gmail.com>
Date:	Fri, 17 Aug 2012 18:30:36 +0200
From:	Tomas Hlavacek <tmshlvck@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	alan@...ux.intel.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, marek.vasut@...il.com
Subject: Re: [PATCHv3 1/1] [RFC] uartclk from serial_core exposed to sysfs

Hello Greg!

On Fri, Aug 17, 2012 at 5:06 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
>> @@ -2355,6 +2373,14 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
>>       }
>>
>>       /*
>> +      * Expose uartclk in sysfs. Use driverdata of the tty device for
>> +      * referencing the UART port.
>> +      */
>> +     dev_set_drvdata(tty_dev, port);
>> +     if (device_create_file(tty_dev, &dev_attr_uartclk) < 0)
>> +             dev_err(tty_dev, "Failed to add uartclk attr\n");
>
> I think you just raced with userspace in creating the file after the
> device was announced to userspace.  Are you sure it's ok?
>
> If not (hint, I don't think so), please make it a default attribute of
> the device, which will then cause the file to be created before it is
> announced to userspace.  It will also be less code as you don't have to
> clean it up by hand :)

Do you mean I should modify the tty_register_device() function not to
use device_create() but it should rather do the device initialization
on it's own. And I should add add the attribute (via struct
attribute_group) to struct device in between device_initialize() and
device_add() calls. Did I get it right?

Thanks,
Tomas
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