linux-kernel - [PATCH] habanalabs: patched cb equals user cb in device memset

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Date:   Fri, 24 Jan 2020 10:18:59 +0200
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: patched cb equals user cb in device memset

During device memory memset, the driver allocates and use a CB (command
buffer). To reuse existing code, it keeps a pointer to the CB in two
variables, user_cb and patched_cb. Therefore, there is no need to "put"
both the user_cb and patched_cb, as it will cause an underflow of the
refcnt of the CB.

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

diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 382331cc00d3..74785ccd2cb1 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -4693,8 +4693,6 @@ static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u64 size,
 
 	rc = goya_send_job_on_qman0(hdev, job);
 
-	hl_cb_put(job->patched_cb);
-
 	hl_debugfs_remove_job(hdev, job);
 	kfree(job);
 	cb->cs_cnt--;
-- 
2.17.1