serial: 8250_mtk: Use port lock wrappers

When a serial port is used for kernel console output, then all
modifications to the UART registers which are done from other contexts,
e.g. getty, termios, are interference points for the kernel console.

So far this has been ignored and the printk output is based on the
principle of hope. The rework of the console infrastructure which aims to
support threaded and atomic consoles, requires to mark sections which
modify the UART registers as unsafe. This allows the atomic write function
to make informed decisions and eventually to restore operational state. It
also allows to prevent the regular UART code from modifying UART registers
while printk output is in progress.

All modifications of UART registers are guarded by the UART port lock,
which provides an obvious synchronization point with the console
infrastructure.

To avoid adding this functionality to all UART drivers, wrap the
spin_[un]lock*() invocations for uart_port::lock into helper functions
which just contain the spin_[un]lock*() invocations for now. In a
subsequent step these helpers will gain the console synchronization
mechanisms.

Converted with coccinelle. No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20230914183831.587273-12-john.ogness@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 74da5676ce67dcdc19514580fa06ac70df30fd2f..23457daae8a148c6237e0262079cd401a72a7ea2 100644 (file)
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -102,7 +102,7 @@ static void mtk8250_dma_rx_complete(void *param)
        if (data->rx_status == DMA_RX_SHUTDOWN)
                return;
 
-       spin_lock_irqsave(&up->port.lock, flags);
+       uart_port_lock_irqsave(&up->port, &flags);
 
        dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
        total = dma->rx_size - state.residue;
@@ -128,7 +128,7 @@ static void mtk8250_dma_rx_complete(void *param)
 
        mtk8250_rx_dma(up);
 
-       spin_unlock_irqrestore(&up->port.lock, flags);
+       uart_port_unlock_irqrestore(&up->port, flags);
 }
 
 static void mtk8250_rx_dma(struct uart_8250_port *up)
@@ -368,7 +368,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
         * Ok, we're now changing the port state.  Do it with
         * interrupts disabled.
         */
-       spin_lock_irqsave(&port->lock, flags);
+       uart_port_lock_irqsave(port, &flags);
 
        /*
         * Update the per-port timeout.
@@ -416,7 +416,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
        if (uart_console(port))
                up->port.cons->cflag = termios->c_cflag;
 
-       spin_unlock_irqrestore(&port->lock, flags);
+       uart_port_unlock_irqrestore(port, flags);
        /* Don't rewrite B0 */
        if (tty_termios_baud_rate(termios))
                tty_termios_encode_baud_rate(termios, baud, baud);