linux-kernel - [PATCH v3 02/20] of: Update of_device_get

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Date:   Wed,  8 Mar 2023 16:31:42 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        <linux-kernel@...r.kernel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Walle <michael@...le.cc>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Robert Marko <robert.marko@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v3 02/20] of: Update of_device_get_modalias()

This function only needs a "struct device_node" to work, but for
convenience the author (and only user) of this helper did use a "struct
device" and put it in device.c.

Let's convert this helper to take a "struct device node" instead. This
change asks for two additional changes: renaming it "of_modalias()"
to fit the current naming, and moving it outside of device.c which will
be done in a follow-up commit.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
Hello, please mind that I am on purpose dropping the check for
of_node_reused in the request_module helper because I believe
this check simply does not apply here. If I am misunderstanding
something please let me know.
Thanks!
---
 drivers/of/device.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index c91bb5899256..351c505ecb50 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -248,7 +248,7 @@ const void *of_device_get_match_data(const struct device *dev)
 }
 EXPORT_SYMBOL(of_device_get_match_data);
 
-static ssize_t of_device_get_modalias(const struct device *dev, char *str, ssize_t len)
+static ssize_t of_modalias(const struct device_node *np, char *str, ssize_t len)
 {
 	const char *compat;
 	char *c;
@@ -256,19 +256,16 @@ static ssize_t of_device_get_modalias(const struct device *dev, char *str, ssize
 	ssize_t csize;
 	ssize_t tsize;
 
-	if ((!dev) || (!dev->of_node) || dev->of_node_reused)
-		return -ENODEV;
-
 	/* Name & Type */
 	/* %p eats all alphanum characters, so %c must be used here */
-	csize = snprintf(str, len, "of:N%pOFn%c%s", dev->of_node, 'T',
-			 of_node_get_device_type(dev->of_node));
+	csize = snprintf(str, len, "of:N%pOFn%c%s", np, 'T',
+			 of_node_get_device_type(np));
 	tsize = csize;
 	len -= csize;
 	if (str)
 		str += csize;
 
-	of_property_for_each_string(dev->of_node, "compatible", p, compat) {
+	of_property_for_each_string(np, "compatible", p, compat) {
 		csize = strlen(compat) + 1;
 		tsize += csize;
 		if (csize > len)
@@ -293,7 +290,10 @@ int of_device_request_module(struct device *dev)
 	ssize_t size;
 	int ret;
 
-	size = of_device_get_modalias(dev, NULL, 0);
+	if (!dev || !dev->of_node)
+		return -ENODEV;
+
+	size = of_modalias(dev->of_node, NULL, 0);
 	if (size < 0)
 		return size;
 
@@ -304,7 +304,7 @@ int of_device_request_module(struct device *dev)
 	if (!str)
 		return -ENOMEM;
 
-	of_device_get_modalias(dev, str, size);
+	of_modalias(dev->of_node, str, size);
 	str[size - 1] = '\0';
 	ret = request_module(str);
 	kfree(str);
@@ -321,7 +321,12 @@ EXPORT_SYMBOL_GPL(of_device_request_module);
  */
 ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
 {
-	ssize_t sl = of_device_get_modalias(dev, str, len - 2);
+	ssize_t sl;
+
+	if (!dev || !dev->of_node || dev->of_node_reused)
+		return -ENODEV;
+
+	sl = of_modalias(dev->of_node, str, len - 2);
 	if (sl < 0)
 		return sl;
 	if (sl > len - 2)
@@ -386,8 +391,8 @@ int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *
 	if (add_uevent_var(env, "MODALIAS="))
 		return -ENOMEM;
 
-	sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
-				    sizeof(env->buf) - env->buflen);
+	sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],
+			 sizeof(env->buf) - env->buflen);
 	if (sl < 0)
 		return sl;
 	if (sl >= (sizeof(env->buf) - env->buflen))
-- 
2.34.1