linux-kernel - [PATCH] media: imon: Convert sprintf/snprintf to sysfs

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Date: Thu, 14 Mar 2024 17:13:57 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Sean Young <sean@...s.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org
Subject: [PATCH] media: imon: 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: Sean Young <sean@...s.org>
CC: Mauro Carvalho Chehab <mchehab@...nel.org>
CC: linux-media@...r.kernel.org
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
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/media/rc/imon.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index 5719dda6e0f0..0b55314a8082 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -845,13 +845,13 @@ static ssize_t imon_clock_show(struct device *d,
 	mutex_lock(&ictx->lock);
 
 	if (!ictx->display_supported) {
-		len = snprintf(buf, PAGE_SIZE, "Not supported.");
+		len = sysfs_emit(buf, "Not supported.");
 	} else {
-		len = snprintf(buf, PAGE_SIZE,
-			"To set the clock on your iMON display:\n"
-			"# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
-			"%s", ictx->display_isopen ?
-			"\nNOTE: imon device must be closed\n" : "");
+		len = sysfs_emit(buf,
+				 "To set the clock on your iMON display:\n"
+				 "# date \"+%%y %%m %%d %%w %%H %%M %%S\" > imon_clock\n"
+				 "%s", ictx->display_isopen ?
+				 "\nNOTE: imon device must be closed\n" : "");
 	}
 
 	mutex_unlock(&ictx->lock);
-- 
2.29.2