linux-kernel - [PATCH v2 3/3] wifi: ti: Convert sprintf/snprintf to sysfs

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Date: Fri, 15 Mar 2024 13:52:11 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Kalle Valo <kvalo@...nel.org>,
	linux-wireless@...r.kernel.org
Subject: [PATCH v2 3/3] wifi: ti: Convert sprintf/snprintf 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().

sprintf() will be converted as weel if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Kalle Valo <kvalo@...nel.org>
CC: linux-wireless@...r.kernel.org
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V2: subject updated

This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
 drivers/net/wireless/ti/wlcore/sysfs.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/sysfs.c b/drivers/net/wireless/ti/wlcore/sysfs.c
index f0c7e09b314d..c07acfcbbd9c 100644
--- a/drivers/net/wireless/ti/wlcore/sysfs.c
+++ b/drivers/net/wireless/ti/wlcore/sysfs.c
@@ -19,11 +19,8 @@ static ssize_t bt_coex_state_show(struct device *dev,
 	struct wl1271 *wl = dev_get_drvdata(dev);
 	ssize_t len;
 
-	len = PAGE_SIZE;
-
 	mutex_lock(&wl->mutex);
-	len = snprintf(buf, len, "%d\n\n0 - off\n1 - on\n",
-		       wl->sg_enabled);
+	len = sysfs_emit(buf, "%d\n\n0 - off\n1 - on\n", wl->sg_enabled);
 	mutex_unlock(&wl->mutex);
 
 	return len;
@@ -78,13 +75,11 @@ static ssize_t hw_pg_ver_show(struct device *dev,
 	struct wl1271 *wl = dev_get_drvdata(dev);
 	ssize_t len;
 
-	len = PAGE_SIZE;
-
 	mutex_lock(&wl->mutex);
 	if (wl->hw_pg_ver >= 0)
-		len = snprintf(buf, len, "%d\n", wl->hw_pg_ver);
+		len = sysfs_emit(buf, "%d\n", wl->hw_pg_ver);
 	else
-		len = snprintf(buf, len, "n/a\n");
+		len = sysfs_emit(buf, "n/a\n");
 	mutex_unlock(&wl->mutex);
 
 	return len;
-- 
2.29.2