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From:   Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Stuart Yoder <stuyoder@gmail.com>,
        Laurentiu Tudor <laurentiu.tudor@nxp.com>,
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        Haiyang Zhang <haiyangz@microsoft.com>,
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        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Subject: [PATCH v2 05/11] pci: use helper for safer setting of driver_override
Date:   Wed, 23 Feb 2022 20:13:04 +0100
Message-Id: <20220223191310.347669-6-krzysztof.kozlowski@canonical.com>
In-Reply-To: <20220223191310.347669-1-krzysztof.kozlowski@canonical.com>
References: <20220223191310.347669-1-krzysztof.kozlowski@canonical.com>
MIME-Version: 1.0
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Precedence: bulk

Use a helper for seting driver_override to reduce amount of duplicated
code.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/pci/pci-sysfs.c | 24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 602f0fb0b007..16a163d4623e 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -567,31 +567,15 @@ static ssize_t driver_override_store(struct device *dev,
 				     const char *buf, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
-	char *driver_override, *old, *cp;
+	int ret;
 
 	/* We need to keep extra room for a newline */
 	if (count >= (PAGE_SIZE - 1))
 		return -EINVAL;
 
-	driver_override = kstrndup(buf, count, GFP_KERNEL);
-	if (!driver_override)
-		return -ENOMEM;
-
-	cp = strchr(driver_override, '\n');
-	if (cp)
-		*cp = '\0';
-
-	device_lock(dev);
-	old = pdev->driver_override;
-	if (strlen(driver_override)) {
-		pdev->driver_override = driver_override;
-	} else {
-		kfree(driver_override);
-		pdev->driver_override = NULL;
-	}
-	device_unlock(dev);
-
-	kfree(old);
+	ret = driver_set_override(dev, &pdev->driver_override, buf);
+	if (ret)
+		return ret;
 
 	return count;
 }
-- 
2.32.0