linux-kernel - Re: [PATCH 1/2] tty: serial_core: Add name field to uart

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Date:   Thu, 23 Mar 2017 17:43:36 +0530
From:   Vignesh R <vigneshr@...com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Jisheng Zhang <jszhang@...vell.com>
Subject: Re: [PATCH 1/2] tty: serial_core: Add name field to uart_port struct



On Thursday 23 March 2017 12:15 AM, Andy Shevchenko wrote:
> On Tue, Mar 21, 2017 at 3:36 PM, Vignesh R <vigneshr@...com> wrote:
>> Introduce a field to store name of uart_port that can be used to easily
>> identify uart port instances on a system that has more than one uart
> 
> uart -> UART
> 
>> instance. The name is of the form ttyXN(eg. ttyS0, ttyAMA0,..) where N
>> is number that particular uart instance.
>> This field will be useful when printing debug info for a particular port
>> or in register irqs with unique irq name. Port name is populated during
> 
> irq(s) -> IRQ(s)
> 
>> uart_add_one_port().
> 
>> +       snprintf(uport->name, sizeof(uport->name), "%s%d", drv->dev_name,
>> +                drv->tty_driver->name_base + uport->line);
> 
> This is fragile. dev_name is defined as pointer, so, it would be any length.
> So, better to use [devm_]kasprintf().
> 

Ok, will you use kasprintf() (and corresponding kfree()) as device is
not yet allocated at this stage to use devm_*.

-- 
Regards
Vignesh