diff options
| author | Peter Hung <hpeter@gmail.com> | 2015-03-17 17:48:21 +0800 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2015-03-27 17:29:26 +0100 |
| commit | 7139c932859f5b35b5a928b445e03f5a43610fa7 (patch) | |
| tree | 3340210ec92e0a07eabf2121aeb15572033fb2b2 /drivers/usb/serial/f81232.c | |
| parent | 8885078949fbb78c6be39ed2c653e4e883568e2f (diff) | |
| download | talos-obmc-linux-7139c932859f5b35b5a928b445e03f5a43610fa7.tar.gz talos-obmc-linux-7139c932859f5b35b5a928b445e03f5a43610fa7.zip | |
USB: f81232: change lock mechanism
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@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/f81232.c')
| -rw-r--r-- | drivers/usb/serial/f81232.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 4664cf4cc7a8..12840cdc8532 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); |
