From: Bernhard Seibold mail@bernhard-seibold.de
[ Upstream commit 306320034e8fbe7ee1cc4f5269c55658b4612048 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/tty/serial/lantiq.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c index de2d051cd7664..6cd168cb673fd 100644 --- a/drivers/tty/serial/lantiq.c +++ b/drivers/tty/serial/lantiq.c @@ -259,6 +259,7 @@ lqasc_err_int(int irq, void *_port) unsigned long flags; struct uart_port *port = (struct uart_port *)_port; spin_lock_irqsave(<q_asc_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);