linux-kernel - [PATCH 2/2] firewire: Convert snprintf/sprintf to sysfs

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Date: Mon, 22 Jan 2024 13:39:42 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Takashi Sakamoto <o-takashi@...amocchi.jp>,
	linux1394-devel@...ts.sourceforge.net,
	Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH 2/2] firewire: Convert snprintf/sprintf to sysfs_emit

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

> drivers/firewire/core-device.c:326:8-16: WARNING: please use sysfs_emit or sysfs_emit_at

No functional change intended

Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
"[PATCH 00/42] Fix coccicheck warnings"[1] is trying to fix all warnings
reported by coccicheck. firewire introduce newly abused snprintf case.
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/firewire/core-device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 47d6cb3dc916..790985479ff3 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -323,7 +323,7 @@ static ssize_t show_immediate(struct device *dev,
 	if (value < 0)
 		return -ENOENT;
 
-	return snprintf(buf, PAGE_SIZE, "0x%06x\n", value);
+	return sysfs_emit(buf, "0x%06x\n", value);
 }
 
 #define IMMEDIATE_ATTR(name, key)				\
@@ -474,7 +474,7 @@ static ssize_t is_local_show(struct device *dev,
 {
 	struct fw_device *device = fw_device(dev);
 
-	return sprintf(buf, "%u\n", device->is_local);
+	return sysfs_emit(buf, "%u\n", device->is_local);
 }
 
 static int units_sprintf(char *buf, const u32 *directory)
-- 
2.29.2