Commit dbf1115d authored by Claudio Scordino's avatar Claudio Scordino Committed by Greg Kroah-Hartman

atmel_serial: fix spinlock lockup in RS485 code

Patch to fix a spinlock lockup in the driver that sometimes happens when the
tasklet starts.
Signed-off-by: default avatarClaudio Scordino <claudio@evidence.eu.com>
Signed-off-by: default avatarDave Bender <codehero@gmail.com>
Tested-by: default avatarDave Bender <codehero@gmail.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 106b5fa7
......@@ -212,8 +212,9 @@ void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned int mode;
unsigned long flags;
spin_lock(&port->lock);
spin_lock_irqsave(&port->lock, flags);
/* Disable interrupts */
UART_PUT_IDR(port, atmel_port->tx_done_mask);
......@@ -244,7 +245,7 @@ void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
/* Enable interrupts */
UART_PUT_IER(port, atmel_port->tx_done_mask);
spin_unlock(&port->lock);
spin_unlock_irqrestore(&port->lock, flags);
}
......
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