diff options
Diffstat (limited to 'drivers/ptp/ptp_sysfs.c')
| -rw-r--r-- | drivers/ptp/ptp_sysfs.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c index 6e4d5456a885..7d023d9d0acb 100644 --- a/drivers/ptp/ptp_sysfs.c +++ b/drivers/ptp/ptp_sysfs.c @@ -75,17 +75,21 @@ static ssize_t extts_fifo_show(struct device *dev, struct device_attribute *attr, char *page) { struct ptp_clock *ptp = dev_get_drvdata(dev); - struct timestamp_event_queue *queue = &ptp->tsevq; + struct timestamp_event_queue *queue; struct ptp_extts_event event; unsigned long flags; size_t qcnt; int cnt = 0; - memset(&event, 0, sizeof(event)); + cnt = list_count_nodes(&ptp->tsevqs); + if (cnt <= 0) + goto out; - if (mutex_lock_interruptible(&ptp->tsevq_mux)) - return -ERESTARTSYS; + /* The sysfs fifo will always draw from the fist queue */ + queue = list_first_entry(&ptp->tsevqs, struct timestamp_event_queue, + qlist); + memset(&event, 0, sizeof(event)); spin_lock_irqsave(&queue->lock, flags); qcnt = queue_cnt(queue); if (qcnt) { @@ -100,7 +104,6 @@ static ssize_t extts_fifo_show(struct device *dev, cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n", event.index, event.t.sec, event.t.nsec); out: - mutex_unlock(&ptp->tsevq_mux); return cnt; } static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL); |