diff options
| author | Xabier Marquiegui <reibax@gmail.com> | 2023-10-12 00:39:55 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-15 20:07:52 +0100 |
| commit | 8f5de6fb245326704f37d91780b9a10253a8a100 (patch) | |
| tree | a37b5c6fc49fa23bf73af97bb9146b28d75d78d4 /drivers/ptp/ptp_sysfs.c | |
| parent | d26ab5a35ad9920940a9e07665130d501b2ae1a3 (diff) | |
ptp: support multiple timestamp event readers
Use linked lists to create one event queue per open file. This enables
simultaneous readers for timestamp event queues.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp/ptp_sysfs.c')
| -rw-r--r-- | drivers/ptp/ptp_sysfs.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c index 2675f383cd0a..7d023d9d0acb 100644 --- a/drivers/ptp/ptp_sysfs.c +++ b/drivers/ptp/ptp_sysfs.c @@ -81,15 +81,15 @@ static ssize_t extts_fifo_show(struct device *dev, size_t qcnt; int cnt = 0; + cnt = list_count_nodes(&ptp->tsevqs); + if (cnt <= 0) + goto out; + /* 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)); - - if (mutex_lock_interruptible(&ptp->tsevq_mux)) - return -ERESTARTSYS; - spin_lock_irqsave(&queue->lock, flags); qcnt = queue_cnt(queue); if (qcnt) { @@ -104,7 +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); |