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atmel_serial: fix spinlock lockup in RS485 code

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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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Claudio Scordino 2011-12-16 15:08:49 +01:00 committed by Greg Kroah-Hartman
parent 106b5fa700
commit dbf1115d3f
1 changed files with 3 additions and 2 deletions
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5
drivers/tty/serial/atmel_serial.c
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@ -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); struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned int mode; unsigned int mode;
unsigned long flags;
spin_lock(&port->lock); spin_lock_irqsave(&port->lock, flags);
/* Disable interrupts */ /* Disable interrupts */
UART_PUT_IDR(port, atmel_port->tx_done_mask); 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 */ /* Enable interrupts */
UART_PUT_IER(port, atmel_port->tx_done_mask); UART_PUT_IER(port, atmel_port->tx_done_mask);
spin_unlock(&port->lock); spin_unlock_irqrestore(&port->lock, flags);
} }