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serial: sh-sci: Move uart_register_driver call to device probe

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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 overlapping major/minor numbers are
included.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sjoerd Simons 2017-04-20 14:13:01 +02:00 committed by Greg Kroah-Hartman
parent bd8766b158
commit 352b926645
1 changed files with 15 additions and 11 deletions
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26
drivers/tty/serial/sh-sci.c
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@ -2962,6 +2962,7 @@ static inline int sci_probe_earlyprintk(struct platform_device *pdev)
static const char banner[] __initconst = "SuperH (H)SCI(F) driver initialized";
static DEFINE_MUTEX(sci_uart_registration_lock);
static struct uart_driver sci_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "sci",
@ -3090,6 +3091,16 @@ static int sci_probe_single(struct platform_device *dev,
return -EINVAL;
}
mutex_lock(&sci_uart_registration_lock);
if (!sci_uart_driver.state) {
ret = uart_register_driver(&sci_uart_driver);
if (ret) {
mutex_unlock(&sci_uart_registration_lock);
return ret;
}
}
mutex_unlock(&sci_uart_registration_lock);
ret = sci_init_single(dev, sciport, index, p, false);
if (ret)
return ret;
@ -3213,24 +3224,17 @@ static struct platform_driver sci_driver = {
static int __init sci_init(void)
{
int ret;
pr_info("%s\n", banner);
ret = uart_register_driver(&sci_uart_driver);
if (likely(ret == 0)) {
ret = platform_driver_register(&sci_driver);
if (unlikely(ret))
uart_unregister_driver(&sci_uart_driver);
}
return ret;
return platform_driver_register(&sci_driver);
}
static void __exit sci_exit(void)
{
platform_driver_unregister(&sci_driver);
uart_unregister_driver(&sci_uart_driver);
if (sci_uart_driver.state)
uart_unregister_driver(&sci_uart_driver);
}
#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE