serial: pch: Don't disable interrupts while acquiring lock in ISR.

The interrupt service routine is always invoked with disabled
interrupts.

Remove the _irqsave() from the locking functions in the interrupts
service routine/ pch_uart_interrupt().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240301215246.891055-16-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 124eb816fca7e0ba522db6191e29ce6c06884c9c..6e259f4139153ccd322136c3ea72e5a959d848fe 100644 (file)
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1010,11 +1010,10 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
        u8 lsr;
        int ret = 0;
        unsigned char iid;
-       unsigned long flags;
        int next = 1;
        u8 msr;
 
-       spin_lock_irqsave(&priv->lock, flags);
+       spin_lock(&priv->lock);
        handled = 0;
        while (next) {
                iid = pch_uart_hal_get_iid(priv);
@@ -1074,7 +1073,7 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
                handled |= (unsigned int)ret;
        }
 
-       spin_unlock_irqrestore(&priv->lock, flags);
+       spin_unlock(&priv->lock);
        return IRQ_RETVAL(handled);
 }