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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>
This commit is contained in:
Vignesh R 2017-03-24 10:57:59 +05:30 committed by Greg Kroah-Hartman
parent 7cd3e9dbdd
commit f7048b1590
2 changed files with 8 additions and 0 deletions
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7
drivers/tty/serial/serial_core.c
View File

@ -2744,6 +2744,12 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
state->pm_state = UART_PM_STATE_UNDEFINED; state->pm_state = UART_PM_STATE_UNDEFINED;
uport->cons = drv->cons; uport->cons = drv->cons;
uport->minor = drv->tty_driver->minor_start + uport->line; 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 * 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) if (uport->type != PORT_UNKNOWN && uport->ops->release_port)
uport->ops->release_port(uport); uport->ops->release_port(uport);
kfree(uport->tty_groups); kfree(uport->tty_groups);
kfree(uport->name);
/* /*
* Indicate that there isn't a port here anymore. * Indicate that there isn't a port here anymore.

1
include/linux/serial_core.h
View File

@ -247,6 +247,7 @@ struct uart_port {
unsigned char suspended; unsigned char suspended;
unsigned char irq_wake; unsigned char irq_wake;
unsigned char unused[2]; unsigned char unused[2];
char *name; /* port name */
struct attribute_group *attr_group; /* port specific attributes */ struct attribute_group *attr_group; /* port specific attributes */
const struct attribute_group **tty_groups; /* all attributes (serial core use only) */ const struct attribute_group **tty_groups; /* all attributes (serial core use only) */
struct serial_rs485 rs485; struct serial_rs485 rs485;