From: Bernhard Seibold mail@bernhard-seibold.de
commit 306320034e8fbe7ee1cc4f5269c55658b4612048 upstream.
Currently, the error interrupt is never acknowledged, so once active it will stay active indefinitely, causing the handler to be called in an infinite loop.
Fixes: 2f0fc4159a6a ("SERIAL: Lantiq: Add driver for MIPS Lantiq SOCs.") Cc: stable@vger.kernel.org Signed-off-by: Bernhard Seibold mail@bernhard-seibold.de Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Message-ID: 20230602133029.546-1-mail@bernhard-seibold.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/lantiq.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/tty/serial/lantiq.c +++ b/drivers/tty/serial/lantiq.c @@ -274,6 +274,7 @@ lqasc_err_int(int irq, void *_port) struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
spin_lock_irqsave(<q_port->lock, flags); + __raw_writel(ASC_IRNCR_EIR, port->membase + LTQ_ASC_IRNCR); /* clear any pending interrupts */ asc_update_bits(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE | ASCWHBSTATE_CLRROE, port->membase + LTQ_ASC_WHBSTATE);