From: Shreshtha Kumar Sahu <shreshthakumar.sahu@xxxxxxxxxxxxxx> All previous interrupts should be cleared before installing interrupt handler i.e. before request_irq. pl011_shutdown clears the interrupt register but there may be case where bootloader transfers control to kernel and there are some pending interrupts. In this case interrupt handler will get called even before interrupt mask is enabled. Change-Id: Ie58ca0a36dec76ac38babc057ce1d66b3129d8f9 Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> --- drivers/tty/serial/amba-pl011.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 6958594..6dafaa2 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1381,6 +1381,15 @@ static int pl011_startup(struct uart_port *port) uap->port.uartclk = clk_get_rate(uap->clk); /* + * Clear previous interrupts before installing interrupt handler + */ + spin_lock_irq(&uap->port.lock); + uap->im = 0; + writew(uap->im, uap->port.membase + UART011_IMSC); + writew(0xffff, uap->port.membase + UART011_ICR); + spin_unlock_irq(&uap->port.lock); + + /* * Allocate the IRQ */ retval = request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap); -- 1.7.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
