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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Weili Qian <qianweili@huawei.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 379/530] crypto: hisilicon/qm - fix missing put dfx access
Date:   Mon, 24 Oct 2022 13:32:03 +0200
Message-Id: <20221024113102.200479518@linuxfoundation.org>
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From: Weili Qian <qianweili@huawei.com>

[ Upstream commit 5afc904f443de2afd31c4e0686ba178beede86fe ]

In function qm_cmd_write(), if function returns from
branch 'atomic_read(&qm->status.flags) == QM_STOP',
the got dfx access is forgotten to put.

Fixes: 607c191b371d ("crypto: hisilicon - support runtime PM for accelerator device")
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/hisilicon/qm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index b616d2d8e773..b8900a5dbf6e 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -1888,8 +1888,10 @@ static ssize_t qm_cmd_write(struct file *filp, const char __user *buffer,
 		return ret;
 
 	/* Judge if the instance is being reset. */
-	if (unlikely(atomic_read(&qm->status.flags) == QM_STOP))
-		return 0;
+	if (unlikely(atomic_read(&qm->status.flags) == QM_STOP)) {
+		ret = 0;
+		goto put_dfx_access;
+	}
 
 	if (count > QM_DBG_WRITE_LEN) {
 		ret = -ENOSPC;
-- 
2.35.1