linux-kernel - [PATCH v2 2/3] wifi: b43: Convert sprintf/snprintf to sysfs

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Date: Fri, 15 Mar 2024 13:52:10 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	Kalle Valo <kvalo@...nel.org>,
	linux-wireless@...r.kernel.org,
	b43-dev@...ts.infradead.org
Subject: [PATCH v2 2/3] wifi: b43: 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: Larry Finger <Larry.Finger@...inger.net>
CC: Kalle Valo <kvalo@...nel.org>
CC: linux-wireless@...r.kernel.org
CC: b43-dev@...ts.infradead.org
Acked-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V2:
  subject updated and wrap line style

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/
---
 drivers/net/wireless/broadcom/b43/sysfs.c       | 13 ++++---------
 drivers/net/wireless/broadcom/b43legacy/sysfs.c | 16 ++++++----------
 2 files changed, 10 insertions(+), 19 deletions(-)

diff --git a/drivers/net/wireless/broadcom/b43/sysfs.c b/drivers/net/wireless/broadcom/b43/sysfs.c
index 0679d132968f..261b2b746a9c 100644
--- a/drivers/net/wireless/broadcom/b43/sysfs.c
+++ b/drivers/net/wireless/broadcom/b43/sysfs.c
@@ -53,19 +53,14 @@ static ssize_t b43_attr_interfmode_show(struct device *dev,
 
 	switch (wldev->phy.g->interfmode) {
 	case B43_INTERFMODE_NONE:
-		count =
-		    snprintf(buf, PAGE_SIZE,
-			     "0 (No Interference Mitigation)\n");
+		count = sysfs_emit(buf, "0 (No Interference Mitigation)\n");
 		break;
 	case B43_INTERFMODE_NONWLAN:
-		count =
-		    snprintf(buf, PAGE_SIZE,
-			     "1 (Non-WLAN Interference Mitigation)\n");
+		count = sysfs_emit(buf,
+				   "1 (Non-WLAN Interference Mitigation)\n");
 		break;
 	case B43_INTERFMODE_MANUALWLAN:
-		count =
-		    snprintf(buf, PAGE_SIZE,
-			     "2 (WLAN Interference Mitigation)\n");
+		count = sysfs_emit(buf, "2 (WLAN Interference Mitigation)\n");
 		break;
 	default:
 		B43_WARN_ON(1);
diff --git a/drivers/net/wireless/broadcom/b43legacy/sysfs.c b/drivers/net/wireless/broadcom/b43legacy/sysfs.c
index eec087ca30e6..d988fe541bf7 100644
--- a/drivers/net/wireless/broadcom/b43legacy/sysfs.c
+++ b/drivers/net/wireless/broadcom/b43legacy/sysfs.c
@@ -75,16 +75,14 @@ static ssize_t b43legacy_attr_interfmode_show(struct device *dev,
 
 	switch (wldev->phy.interfmode) {
 	case B43legacy_INTERFMODE_NONE:
-		count = snprintf(buf, PAGE_SIZE, "0 (No Interference"
-				 " Mitigation)\n");
+		count = sysfs_emit(buf, "0 (No Interference Mitigation)\n");
 		break;
 	case B43legacy_INTERFMODE_NONWLAN:
-		count = snprintf(buf, PAGE_SIZE, "1 (Non-WLAN Interference"
-				 " Mitigation)\n");
+		count = sysfs_emit(buf,
+				   "1 (Non-WLAN Interference Mitigation)\n");
 		break;
 	case B43legacy_INTERFMODE_MANUALWLAN:
-		count = snprintf(buf, PAGE_SIZE, "2 (WLAN Interference"
-				 " Mitigation)\n");
+		count = sysfs_emit(buf, "2 (WLAN Interference Mitigation)\n");
 		break;
 	default:
 		B43legacy_WARN_ON(1);
@@ -155,11 +153,9 @@ static ssize_t b43legacy_attr_preamble_show(struct device *dev,
 	mutex_lock(&wldev->wl->mutex);
 
 	if (wldev->short_preamble)
-		count = snprintf(buf, PAGE_SIZE, "1 (Short Preamble"
-				 " enabled)\n");
+		count = sysfs_emit(buf, "1 (Short Preamble enabled)\n");
 	else
-		count = snprintf(buf, PAGE_SIZE, "0 (Short Preamble"
-				 " disabled)\n");
+		count = sysfs_emit(buf, "0 (Short Preamble disabled)\n");
 
 	mutex_unlock(&wldev->wl->mutex);
 
-- 
2.29.2