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From:   Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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Cc:     Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Subject: [PATCH v3 02/11] amba: Use driver_set_override() instead of open-coding
Date:   Sun, 27 Feb 2022 14:52:05 +0100
Message-Id: <20220227135214.145599-3-krzysztof.kozlowski@canonical.com>
In-Reply-To: <20220227135214.145599-1-krzysztof.kozlowski@canonical.com>
References: <20220227135214.145599-1-krzysztof.kozlowski@canonical.com>
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Use a helper for seting driver_override to reduce amount of duplicated
code. Make the driver_override field const char, because it is not
modified by the core and it matches other subsystems.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 drivers/amba/bus.c       | 28 ++++------------------------
 include/linux/amba/bus.h |  7 ++++++-
 2 files changed, 10 insertions(+), 25 deletions(-)

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index e1a5eca3ae3c..9dffa17f50c0 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -94,31 +94,11 @@ static ssize_t driver_override_store(struct device *_dev,
 				     const char *buf, size_t count)
 {
 	struct amba_device *dev = to_amba_device(_dev);
-	char *driver_override, *old, *cp;
-
-	/* 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 = dev->driver_override;
-	if (strlen(driver_override)) {
-		dev->driver_override = driver_override;
-	} else {
-		kfree(driver_override);
-		dev->driver_override = NULL;
-	}
-	device_unlock(_dev);
+	int ret;
 
-	kfree(old);
+	ret = driver_set_override(_dev, &dev->driver_override, buf, count);
+	if (ret)
+		return ret;
 
 	return count;
 }
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
index 6c7f47846971..7c703cb7a3cf 100644
--- a/include/linux/amba/bus.h
+++ b/include/linux/amba/bus.h
@@ -70,7 +70,12 @@ struct amba_device {
 	unsigned int		cid;
 	struct amba_cs_uci_id	uci;
 	unsigned int		irq[AMBA_NR_IRQS];
-	char			*driver_override;
+	/*
+	 * Driver name to force a match.
+	 * Do not set directly, because core frees it.
+	 * Use driver_set_override() to set or clear it.
+	 */
+	const char		*driver_override;
 };
 
 struct amba_driver {
-- 
2.32.0