From: Ilpo Järvinen ilpo.jarvinen@linux.intel.com
[ Upstream commit 6a4241e8f9b17aa17f55842d6478f280c22d2b44 ]
serial8250_handle_irq() assumes it's the first to read LSR register. However, there are 8250 drivers which perform LSR read in their own irq handler prior to calling serial8250_handle_irq(). As not all flags are preserved across LSR reads, use serial_lsr_in() helper to get all the preserved flags.
This commit might fix other commits too besides the ones for DW UART mentioned below. It's just not clear to me which of the other devices clear some of the LSR flags on read. AFAIK, nobody has complained about this problem (either against DW or other devices) so it might not have that bad impact in the end.
Fixes: 424d79183af0 ("serial: 8250_dw: Avoid "too much work" from bogus rx timeout interrupt") Fixes: aa63d786cea2 ("serial: 8250: dw: Add support for DMA flow controlling devices") Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Link: https://lore.kernel.org/r/20220608095431.18376-4-ilpo.jarvinen@linux.intel.c... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/tty/serial/8250/8250_port.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index c9d8c0de56e5..2b86c55ed374 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1922,7 +1922,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
spin_lock_irqsave(&port->lock, flags);
- status = serial_port_in(port, UART_LSR); + status = serial_lsr_in(up);
/* * If port is stopped and there are no error conditions in the