diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/comedi_test.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/comedi_test.c | 24 |
1 files changed, 6 insertions, 18 deletions
diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c index 80d613c0fbc6..6fd2c17125fc 100644 --- a/drivers/staging/comedi/drivers/comedi_test.c +++ b/drivers/staging/comedi/drivers/comedi_test.c @@ -55,10 +55,6 @@ zero volts). #define N_CHANS 8 -enum waveform_state_bits { - WAVEFORM_AI_RUNNING = 0 -}; - /* Data unique to this driver */ struct waveform_private { struct timer_list timer; @@ -67,7 +63,6 @@ struct waveform_private { unsigned long usec_period; /* waveform period in microseconds */ unsigned long usec_current; /* current time (mod waveform period) */ unsigned long usec_remainder; /* usec since last scan */ - unsigned long state_bits; unsigned int scan_period; /* scan period in usec */ unsigned int convert_period; /* conversion period in usec */ unsigned int ao_loopbacks[N_CHANS]; @@ -177,10 +172,6 @@ static void waveform_ai_interrupt(unsigned long arg) unsigned int num_scans; ktime_t now; - /* check command is still active */ - if (!test_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits)) - return; - now = ktime_get(); elapsed_time = ktime_to_us(ktime_sub(now, devpriv->last)); @@ -322,10 +313,6 @@ static int waveform_ai_cmd(struct comedi_device *dev, devpriv->usec_remainder = 0; devpriv->timer.expires = jiffies + 1; - /* mark command as active */ - smp_mb__before_atomic(); - set_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits); - smp_mb__after_atomic(); add_timer(&devpriv->timer); return 0; } @@ -335,11 +322,12 @@ static int waveform_ai_cancel(struct comedi_device *dev, { struct waveform_private *devpriv = dev->private; - /* mark command as no longer active */ - clear_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits); - smp_mb__after_atomic(); - /* cannot call del_timer_sync() as may be called from timer routine */ - del_timer(&devpriv->timer); + if (in_softirq()) { + /* Assume we were called from the timer routine itself. */ + del_timer(&devpriv->timer); + } else { + del_timer_sync(&devpriv->timer); + } return 0; } |