linux-kernel - [PATCH] habanalabs: use correct variable to show fd open counter

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Date:   Mon,  8 Jul 2019 13:43:55 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, oshpigelman@...ana.ai,
        ttayar@...ana.ai
Cc:     gregkh@...uxfoundation.org
Subject: [PATCH] habanalabs: use correct variable to show fd open counter

The current code checks if the user context pointer is NULL or not to
display the number of open file descriptors of a device. However, that
variable (user_ctx) will eventually go away as the driver will support
multiple processes. Instead, the driver can use the atomic counter of
the open file descriptors which the driver already maintains.

Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/sysfs.c b/drivers/misc/habanalabs/sysfs.c
index 25eb46d29d88..881be19b5fad 100644
--- a/drivers/misc/habanalabs/sysfs.c
+++ b/drivers/misc/habanalabs/sysfs.c
@@ -356,7 +356,7 @@ static ssize_t write_open_cnt_show(struct device *dev,
 {
 	struct hl_device *hdev = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%d\n", hdev->user_ctx ? 1 : 0);
+	return sprintf(buf, "%d\n", atomic_read(&hdev->fd_open_cnt));
 }
 
 static ssize_t soft_reset_cnt_show(struct device *dev,
-- 
2.17.1