linux-kernel - [PATCH 7/8] staging: kpc2000: kpc_i2c: fail probe if unable to map I/O space

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Message-Id: <313d7ff86c2bdc4ef42629baa26a8eef893c89c8.1558832514.git.gneukum1@gmail.com>
Date:   Sun, 26 May 2019 01:18:33 +0000
From:   Geordan Neukum <gneukum1@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Geordan Neukum <gneukum1@...il.com>
Subject: [PATCH 7/8] staging: kpc2000: kpc_i2c: fail probe if unable to map I/O space

The kpc2000 driver does not verify whether or not mapping the I/O
space succeeded during probe time. Make the driver verify that the
mapping operation was successful before potentially using that area
in the future.

Signed-off-by: Geordan Neukum <gneukum1@...il.com>
---
 drivers/staging/kpc2000/kpc2000_i2c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/kpc2000/kpc2000_i2c.c b/drivers/staging/kpc2000/kpc2000_i2c.c
index 452052bf9476..51e91653e183 100644
--- a/drivers/staging/kpc2000/kpc2000_i2c.c
+++ b/drivers/staging/kpc2000/kpc2000_i2c.c
@@ -591,6 +591,8 @@ static int pi2c_probe(struct platform_device *pldev)
 		return -ENXIO;
 
 	priv->smba = (unsigned long)ioremap_nocache(res->start, resource_size(res));
+	if (!priv->smba)
+		return -ENOMEM;
 
 	platform_set_drvdata(pldev, priv);
 
-- 
2.21.0