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serial: lantiq: add missing interrupt ack

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commit 306320034e 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: 2f0fc4159a ("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>
This commit is contained in:
Bernhard Seibold 2023-06-02 15:30:29 +02:00 • committed by Greg Kroah-Hartman
commit f4bc416942
1 changed files with 1 additions and 0 deletions
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drivers/tty/serial/lantiq.c
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@ -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);