The commit f9b11229b79c ("serial: 8250: Fix PM usage_count for console handover") fixed one runtime PM usage counter balance problem that occurs because .dev is not set during univ8250 setup preventing call to pm_runtime_get_sync(). Later, univ8250_console_exit() will trigger the runtime PM usage counter underflow as .dev is already set at that time.
Call pm_runtime_get_sync() to balance the RPM usage counter also in serial8250_register_8250_port() before trying to add the port.
Reported-by: Borislav Petkov (AMD) bp@alien8.de Fixes: bedb404e91bb ("serial: 8250_port: Don't use power management for kernel console") Cc: stable@vger.kernel.org Tested-by: Borislav Petkov (AMD) bp@alien8.de Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com --- v2: - Added tags
drivers/tty/serial/8250/8250_core.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 5f9f06911795..68baf75bdadc 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -812,6 +812,9 @@ int serial8250_register_8250_port(const struct uart_8250_port *up) uart->dl_write = up->dl_write;
if (uart->port.type != PORT_8250_CIR) { + if (uart_console_registered(&uart->port)) + pm_runtime_get_sync(uart->port.dev); + if (serial8250_isa_config != NULL) serial8250_isa_config(0, &uart->port, &uart->capabilities);