linux-kernel - [PATCH] firewire: replace snprintf in show functions with sysfs

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Message-Id: <1634280374-4200-1-git-send-email-wangqing@vivo.com>
Date:   Thu, 14 Oct 2021 23:46:14 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] firewire: 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 following coccicheck warning:
drivers/firewire/core-device.c:377: WARNING: use scnprintf or sprintf.
drivers/firewire/core-device.c:408: WARNING: use scnprintf or sprintf.

Signed-off-by: Qing Wang <wangqing@...o.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 6821698..31b9e50 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -374,7 +374,7 @@ static ssize_t rom_index_show(struct device *dev,
 	struct fw_device *device = fw_device(dev->parent);
 	struct fw_unit *unit = fw_unit(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+	return sysfs_emit(buf, "%d\n",
 			(int)(unit->directory - device->config_rom));
 }
 
@@ -405,7 +405,7 @@ static ssize_t guid_show(struct device *dev,
 	int ret;
 
 	down_read(&fw_device_rwsem);
-	ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
+	ret = sysfs_emit(buf, "0x%08x%08x\n",
 		       device->config_rom[3], device->config_rom[4]);
 	up_read(&fw_device_rwsem);
 
-- 
2.7.4