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Date:   Thu, 14 Oct 2021 23:50:10 -0700
From:   Qing Wang <wangqing@...o.com>
To:     linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] most: replace snprintf in show functions with sysfs_emit

show() must not use snprintf() when formatting the value to be
returned to user space.

Fix the coccicheck warnings:
WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/most/core.c     | 52 ++++++++++++++++++++++++-------------------------
 drivers/most/most_usb.c |  4 ++--
 2 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/most/core.c b/drivers/most/core.c
index e4412c7..ba12154 100644
--- a/drivers/most/core.c
+++ b/drivers/most/core.c
@@ -208,7 +208,7 @@ static ssize_t number_of_packet_buffers_show(struct device *dev,
 	struct most_channel *c = to_channel(dev);
 	unsigned int i = c->channel_id;
 
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+	return sysfs_emit(buf, "%d\n",
 			c->iface->channel_vector[i].num_buffers_packet);
 }
 
@@ -219,7 +219,7 @@ static ssize_t number_of_stream_buffers_show(struct device *dev,
 	struct most_channel *c = to_channel(dev);
 	unsigned int i = c->channel_id;
 
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+	return sysfs_emit(buf, "%d\n",
 			c->iface->channel_vector[i].num_buffers_streaming);
 }
 
@@ -230,7 +230,7 @@ static ssize_t size_of_packet_buffer_show(struct device *dev,
 	struct most_channel *c = to_channel(dev);
 	unsigned int i = c->channel_id;
 
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+	return sysfs_emit(buf, "%d\n",
 			c->iface->channel_vector[i].buffer_size_packet);
 }
 
@@ -241,7 +241,7 @@ static ssize_t size_of_stream_buffer_show(struct device *dev,
 	struct most_channel *c = to_channel(dev);
 	unsigned int i = c->channel_id;
 
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+	return sysfs_emit(buf, "%d\n",
 			c->iface->channel_vector[i].buffer_size_streaming);
 }
 
@@ -251,7 +251,7 @@ static ssize_t channel_starving_show(struct device *dev,
 {
 	struct most_channel *c = to_channel(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving);
+	return sysfs_emit(buf, "%d\n", c->is_starving);
 }
 
 static ssize_t set_number_of_buffers_show(struct device *dev,
@@ -260,7 +260,7 @@ static ssize_t set_number_of_buffers_show(struct device *dev,
 {
 	struct most_channel *c = to_channel(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers);
+	return sysfs_emit(buf, "%d\n", c->cfg.num_buffers);
 }
 
 static ssize_t set_buffer_size_show(struct device *dev,
@@ -269,7 +269,7 @@ static ssize_t set_buffer_size_show(struct device *dev,
 {
 	struct most_channel *c = to_channel(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size);
+	return sysfs_emit(buf, "%d\n", c->cfg.buffer_size);
 }
 
 static ssize_t set_direction_show(struct device *dev,
@@ -279,10 +279,10 @@ static ssize_t set_direction_show(struct device *dev,
 	struct most_channel *c = to_channel(dev);
 
 	if (c->cfg.direction & MOST_CH_TX)
-		return snprintf(buf, PAGE_SIZE, "tx\n");
+		return sysfs_emit(buf, "tx\n");
 	else if (c->cfg.direction & MOST_CH_RX)
-		return snprintf(buf, PAGE_SIZE, "rx\n");
-	return snprintf(buf, PAGE_SIZE, "unconfigured\n");
+		return sysfs_emit(buf, "rx\n");
+	return sysfs_emit(buf, "unconfigured\n");
 }
 
 static ssize_t set_datatype_show(struct device *dev,
@@ -294,10 +294,10 @@ static ssize_t set_datatype_show(struct device *dev,
 
 	for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
 		if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
-			return snprintf(buf, PAGE_SIZE, "%s",
+			return sysfs_emit(buf, "%s",
 					ch_data_type[i].name);
 	}
-	return snprintf(buf, PAGE_SIZE, "unconfigured\n");
+	return sysfs_emit(buf, "unconfigured\n");
 }
 
 static ssize_t set_subbuffer_size_show(struct device *dev,
@@ -306,7 +306,7 @@ static ssize_t set_subbuffer_size_show(struct device *dev,
 {
 	struct most_channel *c = to_channel(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size);
+	return sysfs_emit(buf, "%d\n", c->cfg.subbuffer_size);
 }
 
 static ssize_t set_packets_per_xact_show(struct device *dev,
@@ -315,7 +315,7 @@ static ssize_t set_packets_per_xact_show(struct device *dev,
 {
 	struct most_channel *c = to_channel(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact);
+	return sysfs_emit(buf, "%d\n", c->cfg.packets_per_xact);
 }
 
 static ssize_t set_dbr_size_show(struct device *dev,
@@ -323,7 +323,7 @@ static ssize_t set_dbr_size_show(struct device *dev,
 {
 	struct most_channel *c = to_channel(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size);
+	return sysfs_emit(buf, "%d\n", c->cfg.dbr_size);
 }
 
 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
@@ -395,7 +395,7 @@ static ssize_t description_show(struct device *dev,
 {
 	struct most_interface *iface = dev_get_drvdata(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%s\n", iface->description);
+	return sysfs_emit(buf, "%s\n", iface->description);
 }
 
 static ssize_t interface_show(struct device *dev,
@@ -406,25 +406,25 @@ static ssize_t interface_show(struct device *dev,
 
 	switch (iface->interface) {
 	case ITYPE_LOOPBACK:
-		return snprintf(buf, PAGE_SIZE, "loopback\n");
+		return sysfs_emit(buf, "loopback\n");
 	case ITYPE_I2C:
-		return snprintf(buf, PAGE_SIZE, "i2c\n");
+		return sysfs_emit(buf, "i2c\n");
 	case ITYPE_I2S:
-		return snprintf(buf, PAGE_SIZE, "i2s\n");
+		return sysfs_emit(buf, "i2s\n");
 	case ITYPE_TSI:
-		return snprintf(buf, PAGE_SIZE, "tsi\n");
+		return sysfs_emit(buf, "tsi\n");
 	case ITYPE_HBI:
-		return snprintf(buf, PAGE_SIZE, "hbi\n");
+		return sysfs_emit(buf, "hbi\n");
 	case ITYPE_MEDIALB_DIM:
-		return snprintf(buf, PAGE_SIZE, "mlb_dim\n");
+		return sysfs_emit(buf, "mlb_dim\n");
 	case ITYPE_MEDIALB_DIM2:
-		return snprintf(buf, PAGE_SIZE, "mlb_dim2\n");
+		return sysfs_emit(buf, "mlb_dim2\n");
 	case ITYPE_USB:
-		return snprintf(buf, PAGE_SIZE, "usb\n");
+		return sysfs_emit(buf, "usb\n");
 	case ITYPE_PCIE:
-		return snprintf(buf, PAGE_SIZE, "pcie\n");
+		return sysfs_emit(buf, "pcie\n");
 	}
-	return snprintf(buf, PAGE_SIZE, "unknown\n");
+	return sysfs_emit(buf, "unknown\n");
 }
 
 static DEVICE_ATTR_RO(description);
diff --git a/drivers/most/most_usb.c b/drivers/most/most_usb.c
index 2640c5b..d3790bd9f 100644
--- a/drivers/most/most_usb.c
+++ b/drivers/most/most_usb.c
@@ -830,7 +830,7 @@ static ssize_t value_show(struct device *dev, struct device_attribute *attr,
 	int err;
 
 	if (sysfs_streq(name, "arb_address"))
-		return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
+		return sysfs_emit(buf, "%04x\n", dci_obj->reg_addr);
 
 	if (sysfs_streq(name, "arb_value"))
 		reg_addr = dci_obj->reg_addr;
@@ -842,7 +842,7 @@ static ssize_t value_show(struct device *dev, struct device_attribute *attr,
 	if (err < 0)
 		return err;
 
-	return snprintf(buf, PAGE_SIZE, "%04x\n", val);
+	return sysfs_emit(buf, "%04x\n", val);
 }
 
 static ssize_t value_store(struct device *dev, struct device_attribute *attr,
-- 
2.7.4

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