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USB: ti_usb_3410_5052: Extend locking to msr and shadow mcr

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Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2008-02-20 21:41:40 +00:00 committed by Greg Kroah-Hartman
parent a40d8540f4
commit 04ca89d494
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/serial/ti_usb_3410_5052.c
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@ -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;
}