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path: root/drivers/tty/amiserial.c
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Diffstat (limited to 'drivers/tty/amiserial.c')
-rw-r--r--drivers/tty/amiserial.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 71630a2af42c..979e7c3ea2cb 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1248,6 +1248,8 @@ static int rs_ioctl(struct tty_struct *tty,
struct async_icount cprev, cnow; /* kernel counter temps */
void __user *argp = (void __user *)arg;
unsigned long flags;
+ DEFINE_WAIT(wait);
+ int ret;
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
return -ENODEV;
@@ -1288,25 +1290,33 @@ static int rs_ioctl(struct tty_struct *tty,
cprev = info->icount;
local_irq_restore(flags);
while (1) {
- interruptible_sleep_on(&info->tport.delta_msr_wait);
- /* see if a signal did it */
- if (signal_pending(current))
- return -ERESTARTSYS;
+ prepare_to_wait(&info->tport.delta_msr_wait,
+ &wait, TASK_INTERRUPTIBLE);
local_irq_save(flags);
cnow = info->icount; /* atomic copy */
local_irq_restore(flags);
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
- cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
- return -EIO; /* no change => error */
+ cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
+ ret = -EIO; /* no change => error */
+ break;
+ }
if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
- return 0;
+ ret = 0;
+ break;
+ }
+ schedule();
+ /* see if a signal did it */
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
}
cprev = cnow;
}
- /* NOTREACHED */
+ finish_wait(&info->tport.delta_msr_wait, &wait);
+ return ret;
case TIOCSERGWILD:
case TIOCSERSWILD: