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| author | Hans de Goede <hdegoede@redhat.com> | 2019-04-20 13:22:01 +0200 |
|---|---|---|
| committer | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2019-04-23 18:02:01 +0200 |
| commit | e316aa6e545f0bae82776317bf08ced79a68047d (patch) | |
| tree | df7b1041d8f87c7afd2b6c0cc6ea9629d27b2482 /drivers/hid/hid-logitech-dj.c | |
| parent | de76b1d3332d53ccb1d3600b22a83e7e7b8f0b76 (diff) | |
| download | lwn-e316aa6e545f0bae82776317bf08ced79a68047d.tar.gz lwn-e316aa6e545f0bae82776317bf08ced79a68047d.zip | |
HID: logitech-dj: remove false-positive error on double queueing of delayed-work
The various functions queueing work-items do not check there already is a
work-item queued before calling schedule_work(), as such they may race
with each-other and with the re-queuing done by the delayedwork_callback
itself.
This is fine as the delayedwork_callback simply is a nop if scheduled once
too much. I've actually seen the false-positive hid_err for this trigger
in practice, so lets remove it.
While at it also remove the somewhat overzealous debugging around the
schedule_work() calls.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Diffstat (limited to 'drivers/hid/hid-logitech-dj.c')
| -rw-r--r-- | drivers/hid/hid-logitech-dj.c | 22 |
1 files changed, 4 insertions, 18 deletions
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c index 1488b18266cf..e30ed320207b 100644 --- a/drivers/hid/hid-logitech-dj.c +++ b/drivers/hid/hid-logitech-dj.c @@ -727,17 +727,12 @@ static void delayedwork_callback(struct work_struct *work) count = kfifo_out(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem)); if (count != sizeof(workitem)) { - hid_err(djrcv_dev->hidpp, "delayedwork queued without workitems available\n"); spin_unlock_irqrestore(&djrcv_dev->lock, flags); return; } - if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) { - if (schedule_work(&djrcv_dev->work) == 0) { - dbg_hid("%s: did not schedule the work item, was " - "already queued\n", __func__); - } - } + if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) + schedule_work(&djrcv_dev->work); spin_unlock_irqrestore(&djrcv_dev->lock, flags); @@ -819,11 +814,7 @@ static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev, } kfifo_in(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem)); - - if (schedule_work(&djrcv_dev->work) == 0) { - dbg_hid("%s: did not schedule the work item, was already " - "queued\n", __func__); - } + schedule_work(&djrcv_dev->work); } static void logi_hidpp_dev_conn_notif_equad(struct hidpp_event *hidpp_report, @@ -933,13 +924,8 @@ static void logi_hidpp_recv_queue_notif(struct hid_device *hdev, device_type, hidpp_report->params[HIDPP_PARAM_PROTO_TYPE], hidpp_report->device_index); - kfifo_in(&djrcv_dev->notif_fifo, &workitem, sizeof(workitem)); - - if (schedule_work(&djrcv_dev->work) == 0) { - dbg_hid("%s: did not schedule the work item, was already queued\n", - __func__); - } + schedule_work(&djrcv_dev->work); } static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev, |