Patch "serial: lantiq: add missing interrupt ack" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    serial: lantiq: add missing interrupt ack

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     serial-lantiq-add-missing-interrupt-ack.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 306320034e8fbe7ee1cc4f5269c55658b4612048 Mon Sep 17 00:00:00 2001
From: Bernhard Seibold <mail@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 2 Jun 2023 15:30:29 +0200
Subject: serial: lantiq: add missing interrupt ack
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Bernhard Seibold <mail@xxxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
Signed-off-by: Bernhard Seibold <mail@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Message-ID: <20230602133029.546-1-mail@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 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(&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);


Patches currently in stable-queue which might be from mail@xxxxxxxxxxxxxxxxxxx are

queue-5.10/serial-lantiq-add-missing-interrupt-ack.patch



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