diff options
| author | Claudio Scordino <claudio@evidence.eu.com> | 2011-12-16 15:08:49 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-12 11:33:23 -0800 |
| commit | cf2f03e57c607a7863e6010ca9e5c4d08bc5b48c (patch) | |
| tree | 358efd595aaff5e1c89da51236d6175b4ff85e94 | |
| parent | 2bd145b996b4a6412420b1d1b6909228a3ee727d (diff) | |
atmel_serial: fix spinlock lockup in RS485 code
commit dbf1115d3f8c7052788aa4e6e46abd27f3b3eeba upstream.
Patch to fix a spinlock lockup in the driver that sometimes happens when the
tasklet starts.
Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Dave Bender <codehero@gmail.com>
Tested-by: Dave Bender <codehero@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index b922f5d2e61..948fc77b647 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -199,8 +199,9 @@ 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); @@ -231,7 +232,7 @@ 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); } |