From 963cc981af620c7c07b5f6d1ab998b639e90ecb1 Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 22 Dec 2010 17:16:09 +0000 Subject: [PATCH] ARM: PL011: Ensure IRQs are disabled in UART interrupt handler As the DMA support introduces a separate interrupt-time callback, our interrupt handler will not be the only handler which takes the port lock, so we need to ensure that IRQs are disabled. We must use the _irqsave variant so we don't inadvertently enable interrupts. Acked-by: Linus Walleij Signed-off-by: Russell King --- drivers/serial/amba-pl011.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c index f9b6b8213e77..f741a8b51400 100644 --- a/drivers/serial/amba-pl011.c +++ b/drivers/serial/amba-pl011.c @@ -247,10 +247,11 @@ static void pl011_modem_status(struct uart_amba_port *uap) static irqreturn_t pl011_int(int irq, void *dev_id) { struct uart_amba_port *uap = dev_id; + unsigned long flags; unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; int handled = 0; - spin_lock(&uap->port.lock); + spin_lock_irqsave(&uap->port.lock, flags); status = readw(uap->port.membase + UART011_MIS); if (status) { @@ -275,7 +276,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id) handled = 1; } - spin_unlock(&uap->port.lock); + spin_unlock_irqrestore(&uap->port.lock, flags); return IRQ_RETVAL(handled); } -- 2.20.1