tty: serial_core: Add name field to uart_port struct

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().

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 0fb3f7c..f5572e2 100644 (file)
--- 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 58484fb..6053067 100644 (file)
--- 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;