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tty: serial: uartlite: Use dynamic array for console port

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Driver console functions are using pointer to static array with fixed
size. There can be only one serial console at the time which is found
by register_console(). register_console() is filling cons->index to
port->line value.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2018-08-06 14:22:14 +05:30 committed by Greg Kroah-Hartman
parent 5f6825d1ce
commit deeb33e8fd
1 changed files with 24 additions and 4 deletions
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28
drivers/tty/serial/uartlite.c
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@ -55,6 +55,11 @@
#define ULITE_CONTROL_RST_RX 0x02
#define ULITE_CONTROL_IE 0x10
/* Static pointer to console port */
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
static struct uart_port *console_port;
#endif
struct uartlite_data {
const struct uartlite_reg_ops *reg_ops;
struct clk *clk;
@ -472,7 +477,7 @@ static void ulite_console_putchar(struct uart_port *port, int ch)
static void ulite_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_port *port = &ulite_ports[co->index];
struct uart_port *port = console_port;
unsigned long flags;
unsigned int ier;
int locked = 1;
@ -506,10 +511,8 @@ static int ulite_console_setup(struct console *co, char *options)
int parity = 'n';
int flow = 'n';
if (co->index < 0 || co->index >= ULITE_NR_UARTS)
return -EINVAL;
port = &ulite_ports[co->index];
port = console_port;
/* Has the device been initialized yet? */
if (!port->mapbase) {
@ -652,6 +655,17 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
dev_set_drvdata(dev, port);
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
/*
* If console hasn't been found yet try to assign this port
* because it is required to be assigned for console setup function.
* If register_console() don't assign value, then console_port pointer
* is cleanup.
*/
if (ulite_uart_driver.cons->index == -1)
console_port = port;
#endif
/* Register the port */
rc = uart_add_one_port(&ulite_uart_driver, port);
if (rc) {
@ -661,6 +675,12 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
return rc;
}
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
/* This is not port which is used for console that's why clean it up */
if (ulite_uart_driver.cons->index == -1)
console_port = NULL;
#endif
return 0;
}