From: Bernhard Seibold <mail@bernhard-seibold.de>
Date: Fri, 2 Jun 2023 13:30:29 +0000 (+0200)
Subject: serial: lantiq: add missing interrupt ack
X-Git-Tag: v5.4.248~31
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=94e52fac15196facd5d0a60c186e4081ca27b666;p=thirdparty%2Fkernel%2Fstable.git

serial: lantiq: add missing interrupt ack

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>
---

diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index fcbea43dc3348..cf7fffe8396e7 100644
--- 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(&ltq_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);