Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / drivers / staging / comedi / drivers / comedi_test.c

diff --git a/kernel/drivers/staging/comedi/drivers/comedi_test.c b/kernel/drivers/staging/comedi/drivers/comedi_test.c
index 4ab1866..ec5b9a2 100644 (file)
--- a/kernel/drivers/staging/comedi/drivers/comedi_test.c
+++ b/kernel/drivers/staging/comedi/drivers/comedi_test.c
@@ -56,11 +56,6 @@
 
 #define N_CHANS 8
 
-enum waveform_state_bits {
-       WAVEFORM_AI_RUNNING,
-       WAVEFORM_AO_RUNNING
-};
-
 /* Data unique to this driver */
 struct waveform_private {
        struct timer_list ai_timer;     /* timer for AI commands */
@@ -68,7 +63,6 @@ struct waveform_private {
        unsigned int wf_amplitude;      /* waveform amplitude in microvolts */
        unsigned int wf_period;         /* waveform period in microseconds */
        unsigned int wf_current;        /* current time in waveform period */
-       unsigned long state_bits;
        unsigned int ai_scan_period;    /* AI scan period in usec */
        unsigned int ai_convert_period; /* AI conversion period in usec */
        struct timer_list ao_timer;     /* timer for AO commands */
@@ -191,10 +185,6 @@ static void waveform_ai_timer(unsigned long arg)
        unsigned int nsamples;
        unsigned int time_increment;
 
-       /* check command is still active */
-       if (!test_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits))
-               return;
-
        now = ktime_to_us(ktime_get());
        nsamples = comedi_nsamples_left(s, UINT_MAX);
 
@@ -386,11 +376,6 @@ static int waveform_ai_cmd(struct comedi_device *dev,
         */
        devpriv->ai_timer.expires =
                jiffies + usecs_to_jiffies(devpriv->ai_convert_period) + 1;
-
-       /* mark command as active */
-       smp_mb__before_atomic();
-       set_bit(WAVEFORM_AI_RUNNING, &devpriv->state_bits);
-       smp_mb__after_atomic();
        add_timer(&devpriv->ai_timer);
        return 0;
 }
@@ -400,11 +385,12 @@ 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-       /* mark command as no longer active */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->ai_timer);
+       if (in_softirq()) {
+               /* Assume we were called from the timer routine itself. */
+               del_timer(&devpriv->ai_timer);
+       } else {
+               del_timer_sync(&devpriv->ai_timer);
+       }
        return 0;
 }
 
@@ -436,10 +422,6 @@ static void waveform_ao_timer(unsigned long arg)
        u64 scans_since;
        unsigned int scans_avail = 0;
 
-       /* check command is still active */
-       if (!test_bit(WAVEFORM_AO_RUNNING, &devpriv->state_bits))
-               return;
-
        /* determine number of scan periods since last time */
        now = ktime_to_us(ktime_get());
        scans_since = now - devpriv->ao_last_scan_time;
@@ -518,11 +500,6 @@ static int waveform_ao_inttrig_start(struct comedi_device *dev,
        devpriv->ao_last_scan_time = ktime_to_us(ktime_get());
        devpriv->ao_timer.expires =
                jiffies + usecs_to_jiffies(devpriv->ao_scan_period);
-
-       /* mark command as active */
-       smp_mb__before_atomic();
-       set_bit(WAVEFORM_AO_RUNNING, &devpriv->state_bits);
-       smp_mb__after_atomic();
        add_timer(&devpriv->ao_timer);
 
        return 1;
@@ -608,11 +585,12 @@ static int waveform_ao_cancel(struct comedi_device *dev,
        struct waveform_private *devpriv = dev->private;
 
        s->async->inttrig = NULL;
-       /* mark command as no longer active */
-       clear_bit(WAVEFORM_AO_RUNNING, &devpriv->state_bits);
-       smp_mb__after_atomic();
-       /* cannot call del_timer_sync() as may be called from timer routine */
-       del_timer(&devpriv->ao_timer);
+       if (in_softirq()) {
+               /* Assume we were called from the timer routine itself. */
+               del_timer(&devpriv->ao_timer);
+       } else {
+               del_timer_sync(&devpriv->ao_timer);
+       }
        return 0;
 }