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serial: core: Add minor field to uart_port

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UART drivers that share ttyS namespace cannot trivially compute the
ttyS index from the port->line value since the minor_start may be
offset from minor 64. Further, to do so requires a pointer to the
uart driver since there is no back pointer from uart_port to
uart_driver.

Rather than have UART drivers computing the minor value by themselves,
encapsulate within the serial core at port registration time.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-02-24 14:25:00 -05:00 committed by Greg Kroah-Hartman
parent d3157b2ca5
commit 959801fef9
2 changed files with 2 additions and 0 deletions
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1
drivers/tty/serial/serial_core.c
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@ -2682,6 +2682,7 @@ 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;
/*
* If this port is a console, then the spinlock is already

1
include/linux/serial_core.h
View file

@ -235,6 +235,7 @@ struct uart_port {
const struct uart_ops *ops;
unsigned int custom_divisor;
unsigned int line; /* port index */
unsigned int minor;
resource_size_t mapbase; /* for ioremap */
struct device *dev; /* parent device */
unsigned char hub6; /* this should be in the 8250 driver */