From: Dan Carpenter dan.carpenter@linaro.org
commit 27a826837ec9a3e94cc44bd9328b8289b0fcecd7 upstream.
The atmel_complete_tx_dma() function disables IRQs at the start of the function by calling spin_lock_irqsave(&port->lock, flags); There is no need to disable them a second time using the spin_lock_irq() function and, in fact, doing so is a bug because it will enable IRQs prematurely when we call spin_unlock_irq().
Just use spin_lock/unlock() instead without disabling or enabling IRQs.
Fixes: 08f738be88bb ("serial: at91: add tx dma support") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Reviewed-by: Jiri Slaby jirislaby@kernel.org Acked-by: Richard Genoud richard.genoud@gmail.com Link: https://lore.kernel.org/r/cb7c39a9-c004-4673-92e1-be4e34b85368@moroto.mounta... Cc: stable stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/atmel_serial.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -791,11 +791,11 @@ static void atmel_complete_tx_dma(void *
port->icount.tx += atmel_port->tx_len;
- spin_lock_irq(&atmel_port->lock_tx); + spin_lock(&atmel_port->lock_tx); async_tx_ack(atmel_port->desc_tx); atmel_port->cookie_tx = -EINVAL; atmel_port->desc_tx = NULL; - spin_unlock_irq(&atmel_port->lock_tx); + spin_unlock(&atmel_port->lock_tx);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port);