linux-kernel - [PATCH 5/5] habanalabs: print if device is used on FD close

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Message-Id: <20210222220806.9311-5-ogabbay@kernel.org>
Date:   Tue, 23 Feb 2021 00:08:06 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] habanalabs: print if device is used on FD close

Notify to the user that although he closed the FD, the device is
still in use because there are live CS and/or memory mappings (mmaps).

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c     | 8 +++++---
 drivers/misc/habanalabs/common/habanalabs.h | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 48d301a03d62..6948a1c54083 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -80,9 +80,9 @@ void hl_hpriv_get(struct hl_fpriv *hpriv)
 	kref_get(&hpriv->refcount);
 }
 
-void hl_hpriv_put(struct hl_fpriv *hpriv)
+int hl_hpriv_put(struct hl_fpriv *hpriv)
 {
-	kref_put(&hpriv->refcount, hpriv_release);
+	return kref_put(&hpriv->refcount, hpriv_release);
 }
 
 /*
@@ -103,7 +103,9 @@ static int hl_device_release(struct inode *inode, struct file *filp)
 
 	filp->private_data = NULL;
 
-	hl_hpriv_put(hpriv);
+	if (!hl_hpriv_put(hpriv))
+		dev_warn(hdev->dev,
+			"Device is still in use because there are live CS and/or memory mappings\n");
 
 	return 0;
 }
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 9ba48f322964..046bb44f70f9 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -2182,7 +2182,7 @@ int hl_device_resume(struct hl_device *hdev);
 int hl_device_reset(struct hl_device *hdev, bool hard_reset,
 			bool from_hard_reset_thread);
 void hl_hpriv_get(struct hl_fpriv *hpriv);
-void hl_hpriv_put(struct hl_fpriv *hpriv);
+int hl_hpriv_put(struct hl_fpriv *hpriv);
 int hl_device_set_frequency(struct hl_device *hdev, enum hl_pll_frequency freq);
 uint32_t hl_device_utilization(struct hl_device *hdev, uint32_t period_ms);
 
-- 
2.25.1