USB: ti_usb_3410_5052: Extend locking to msr and shadow mcr

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 3a3776677339..5b470f76e91b 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -1021,14 +1021,17 @@ static int ti_tiocmget(struct usb_serial_port *port, struct file *file)
         unsigned int result;
         unsigned int msr;
         unsigned int mcr;
+        unsigned long flags;
 
         dbg("%s - port %d", __FUNCTION__, port->number);
 
         if (tport == NULL)
                 return -ENODEV;
 
+        spin_lock_irqsave(&tport->tp_lock, flags);
         msr = tport->tp_msr;
         mcr = tport->tp_shadow_mcr;
+        spin_unlock_irqrestore(&tport->tp_lock, flags);
 
         result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
                 | ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
@@ -1049,12 +1052,14 @@ static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
 {
         struct ti_port *tport = usb_get_serial_port_data(port);
         unsigned int mcr;
+        unsigned long flags;
 
         dbg("%s - port %d", __FUNCTION__, port->number);
 
         if (tport == NULL)
                 return -ENODEV;
 
+        spin_lock_irqsave(&tport->tp_lock, flags);
         mcr = tport->tp_shadow_mcr;
 
         if (set & TIOCM_RTS)
@@ -1070,6 +1075,7 @@ static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
                 mcr &= ~TI_MCR_DTR;
         if (clear & TIOCM_LOOP)
                 mcr &= ~TI_MCR_LOOP;
+        spin_unlock_irqrestore(&tport->tp_lock, flags);
 
         return ti_set_mcr(tport, mcr);
 }
@@ -1357,14 +1363,17 @@ static void ti_send(struct ti_port *tport)
 
 static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
 {
+        unsigned long flags;
         int status;
 
         status = ti_write_byte(tport->tp_tdev,
                 tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
                 TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);
 
+        spin_lock_irqsave(&tport->tp_lock, flags);
         if (!status)
                 tport->tp_shadow_mcr = mcr;
+        spin_unlock_irqrestore(&tport->tp_lock, flags);
 
         return status;
 }