[PATCH 1/6] accel/habanalabs: check failure of eventfd_signal

[Oded Gabbay]

From: Dafna Hirschfeld <dhirschf...@habana.ai>

print err log if eventfd_signal return val is not 1 as expected.

Signed-off-by: Dafna Hirschfeld <dhirschf...@habana.ai>
Reviewed-by: Oded Gabbay <ogab...@kernel.org>
Signed-off-by: Oded Gabbay <ogab...@kernel.org>
---
 drivers/accel/habanalabs/common/device.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/accel/habanalabs/common/device.c 
b/drivers/accel/habanalabs/common/device.c
index a365791a9f5c..e81ccafddfb3 100644
--- a/drivers/accel/habanalabs/common/device.c
+++ b/drivers/accel/habanalabs/common/device.c
@@ -2043,13 +2043,19 @@ int hl_device_cond_reset(struct hl_device *hdev, u32 
flags, u64 event_mask)
        return hl_device_reset(hdev, flags | HL_DRV_RESET_HARD);
 }
 
-static void hl_notifier_event_send(struct hl_notifier_event *notifier_event, 
u64 event_mask)
+static void hl_notifier_event_send(struct hl_device *hdev,
+                       struct hl_notifier_event *notifier_event, u64 
event_mask)
 {
+       u64 n;
+
        mutex_lock(&notifier_event->lock);
        notifier_event->events_mask |= event_mask;
 
-       if (notifier_event->eventfd)
-               eventfd_signal(notifier_event->eventfd, 1);
+       if (notifier_event->eventfd) {
+               n = eventfd_signal(notifier_event->eventfd, 1);
+               if (n != 1)
+                       dev_err(hdev->dev, "eventfd signal failed, incremented 
by %llu\n", n);
+       }
 
        mutex_unlock(&notifier_event->lock);
 }
@@ -2073,7 +2079,7 @@ void hl_notifier_event_send_all(struct hl_device *hdev, 
u64 event_mask)
        mutex_lock(&hdev->fpriv_list_lock);
 
        list_for_each_entry(hpriv, &hdev->fpriv_list, dev_node)
-               hl_notifier_event_send(&hpriv->notifier_event, event_mask);
+               hl_notifier_event_send(hdev, &hpriv->notifier_event, 
event_mask);
 
        mutex_unlock(&hdev->fpriv_list_lock);
 }
-- 
2.34.1