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serial: samsung: Move uart_register_driver call to device probe 

uart_register_driver call binds the driver to a specific device
node through tty_register_driver call. This should typically happen
during device probe call.

In a multiplatform scenario, it is possible that multiple serial
drivers are part of the kernel. Currently the driver registration fails
if multiple serial drivers with same default major/minor numbers are
included in the kernel.

A typical case is observed with amba-pl011 and samsung-uart drivers.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tushar Behera 2014-01-20 14:32:34 +05:30 committed by Greg Kroah-Hartman
parent d4f6b412ec
commit 6f134c3c77
1 changed files with 11 additions and 29 deletions
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40
drivers/tty/serial/samsung.c
View File

@ -1282,6 +1282,14 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
if (ret < 0)
goto probe_err;
if (!s3c24xx_uart_drv.state) {
ret = uart_register_driver(&s3c24xx_uart_drv);
if (ret < 0) {
pr_err("Failed to register Samsung UART driver\n");
return ret;
}
}
dbg("%s: adding port\n", __func__);
uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
platform_set_drvdata(pdev, &ourport->port);
@ -1321,6 +1329,8 @@ static int s3c24xx_serial_remove(struct platform_device *dev)
uart_remove_one_port(&s3c24xx_uart_drv, port);
}
uart_unregister_driver(&s3c24xx_uart_drv);
return 0;
}
@ -1820,35 +1830,7 @@ static struct platform_driver samsung_serial_driver = {
},
};
/* module initialisation code */
static int __init s3c24xx_serial_modinit(void)
{
int ret;
ret = uart_register_driver(&s3c24xx_uart_drv);
if (ret < 0) {
pr_err("Failed to register Samsung UART driver\n");
return ret;
}
ret = platform_driver_register(&samsung_serial_driver);
if (ret < 0) {
pr_err("Failed to register platform driver\n");
uart_unregister_driver(&s3c24xx_uart_drv);
}
return ret;
}
static void __exit s3c24xx_serial_modexit(void)
{
platform_driver_unregister(&samsung_serial_driver);
uart_unregister_driver(&s3c24xx_uart_drv);
}
module_init(s3c24xx_serial_modinit);
module_exit(s3c24xx_serial_modexit);
module_platform_driver(samsung_serial_driver);
MODULE_ALIAS("platform:samsung-uart");
MODULE_DESCRIPTION("Samsung SoC Serial port driver");