The original driver lock with spin_lock_irqsave()/spin_unlock_irqrestore() because of it's maybe used in interrupt context f81232_process_read_urb(). We had remove it from previous patch "implement RX bulk-in EP", so we can change it from busying loop spin_lock to sleepable mutex_lock. Signed-off-by: Peter Hung <hpeter+linux_kernel@xxxxxxxxx> --- drivers/usb/serial/f81232.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 6b83870b..61a6a1a 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -19,7 +19,7 @@ #include <linux/serial.h> #include <linux/module.h> #include <linux/moduleparam.h> -#include <linux/spinlock.h> +#include <linux/mutex.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/usb/serial.h> @@ -46,7 +46,7 @@ MODULE_DEVICE_TABLE(usb, id_table); #define UART_CTS 0x80 struct f81232_private { - spinlock_t lock; + struct mutex lock; u8 line_control; u8 modem_status; }; @@ -231,17 +231,16 @@ static void f81232_close(struct usb_serial_port *port) static void f81232_dtr_rts(struct usb_serial_port *port, int on) { struct f81232_private *priv = usb_get_serial_port_data(port); - unsigned long flags; u8 control; - spin_lock_irqsave(&priv->lock, flags); + mutex_lock(&priv->lock); /* Change DTR and RTS */ if (on) priv->line_control |= (CONTROL_DTR | CONTROL_RTS); else priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); control = priv->line_control; - spin_unlock_irqrestore(&priv->lock, flags); + mutex_unlock(&priv->lock); set_control_lines(port->serial->dev, control); } @@ -285,7 +284,7 @@ static int f81232_port_probe(struct usb_serial_port *port) if (!priv) return -ENOMEM; - spin_lock_init(&priv->lock); + mutex_init(&priv->lock); usb_set_serial_port_data(port, priv); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html