linux-kernel - [PATCH v2 10/12] bus/fsl_mc: Do not rely on caller to provide non NULL mc

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Message-Id: <20200507073431.2710-11-diana.craciun@oss.nxp.com>
Date:   Thu,  7 May 2020 10:34:29 +0300
From:   Diana Craciun <diana.craciun@....nxp.com>
To:     linux-kernel@...r.kernel.org
Cc:     laurentiu.tudor@....com, stuyoder@...il.com, leoyang.li@....com,
        linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
        Diana Craciun <diana.craciun@....nxp.com>
Subject: [PATCH v2 10/12] bus/fsl_mc: Do not rely on caller to provide non NULL mc_io

Before destroying the mc_io, check first that it was
allocated.

Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
---
 drivers/bus/fsl-mc/mc-io.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/fsl-mc/mc-io.c b/drivers/bus/fsl-mc/mc-io.c
index 6ae48ad80409..e1dfe4a76519 100644
--- a/drivers/bus/fsl-mc/mc-io.c
+++ b/drivers/bus/fsl-mc/mc-io.c
@@ -129,7 +129,12 @@ int __must_check fsl_create_mc_io(struct device *dev,
  */
 void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
 {
-	struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
+	struct fsl_mc_device *dpmcp_dev;
+
+	if (!mc_io)
+		return;
+
+	dpmcp_dev = mc_io->dpmcp_dev;
 
 	if (dpmcp_dev)
 		fsl_mc_io_unset_dpmcp(mc_io);
-- 
2.17.1