linux-kernel - Re: [PATCH v2 1/2] tty: serial_core: Add name field to uart

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Message-ID: <eddbba43-eeb5-ab93-c486-f50a16eb077c@ti.com>
Date:   Sat, 25 Mar 2017 16:03:31 +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>,
        Jisheng Zhang <jszhang@...vell.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] tty: serial_core: Add name field to uart_port
 struct



On 3/24/2017 5:16 PM, Andy Shevchenko wrote:
> On Fri, Mar 24, 2017 at 7:27 AM, 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
>> 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
>> uart_add_one_port().
>>
> 
> Looks good to me:
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> 
> Just in case, have you checked if there any possible scenarios where
> memory will be leaked?

I ran kmemleak scan after opening and closing a serial port and did not
see any memleak report. Also uport->tty_groups is allocated and
deallocated in the same functions uport->name.

> 
>> Signed-off-by: Vignesh R <vigneshr@...com>
>> ---
>>
>> v2:
>> use kasprintf() instead of snprintf()
>> Fix up commit message.
>>
>>  drivers/tty/serial/serial_core.c | 7 +++++++
>>  include/linux/serial_core.h      | 1 +
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
>> index 0fb3f7cce62a..f5572e28d16a 100644
>> --- a/drivers/tty/serial/serial_core.c
>> +++ b/drivers/tty/serial/serial_core.c
>> @@ -2744,6 +2744,12 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
>>         state->pm_state = UART_PM_STATE_UNDEFINED;
>>         uport->cons = drv->cons;
>>         uport->minor = drv->tty_driver->minor_start + uport->line;
>> +       uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name,
>> +                               drv->tty_driver->name_base + uport->line);
>> +       if (!uport->name) {
>> +               ret = -ENOMEM;
>> +               goto out;
>> +       }
>>
>>         /*
>>          * If this port is a console, then the spinlock is already
>> @@ -2861,6 +2867,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
>>         if (uport->type != PORT_UNKNOWN && uport->ops->release_port)
>>                 uport->ops->release_port(uport);
>>         kfree(uport->tty_groups);
>> +       kfree(uport->name);
>>
>>         /*
>>          * Indicate that there isn't a port here anymore.
>> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
>> index 58484fb35cc8..60530678c633 100644
>> --- a/include/linux/serial_core.h
>> +++ b/include/linux/serial_core.h
>> @@ -247,6 +247,7 @@ struct uart_port {
>>         unsigned char           suspended;
>>         unsigned char           irq_wake;
>>         unsigned char           unused[2];
>> +       char                    *name;                  /* port name */
>>         struct attribute_group  *attr_group;            /* port specific attributes */
>>         const struct attribute_group **tty_groups;      /* all attributes (serial core use only) */
>>         struct serial_rs485     rs485;
>> --
>> 2.11.0
>>
> 
> 
>