linux-kernel - [PATCH] s390/cio: Convert sprintf/snprintf to sysfs

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Date: Thu, 14 Mar 2024 17:52:09 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Vineeth Vijayan <vneethv@...ux.ibm.com>,
	Peter Oberparleiter <oberpar@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	linux-s390@...r.kernel.org
Subject: [PATCH] s390/cio: 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: Vineeth Vijayan <vneethv@...ux.ibm.com>
CC: Peter Oberparleiter <oberpar@...ux.ibm.com>
CC: Heiko Carstens <hca@...ux.ibm.com>
CC: Vasily Gorbik <gor@...ux.ibm.com>
CC: Alexander Gordeev <agordeev@...ux.ibm.com>
CC: Christian Borntraeger <borntraeger@...ux.ibm.com>
CC: Sven Schnelle <svens@...ux.ibm.com>
CC: linux-s390@...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/s390/cio/css.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 094431a62ad5..4fec251ec35d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -309,7 +309,7 @@ static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 {
 	struct subchannel *sch = to_subchannel(dev);
 
-	return sprintf(buf, "%01x\n", sch->st);
+	return sysfs_emit(buf, "%01x\n", sch->st);
 }
 
 static DEVICE_ATTR_RO(type);
@@ -319,7 +319,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 {
 	struct subchannel *sch = to_subchannel(dev);
 
-	return sprintf(buf, "css:t%01X\n", sch->st);
+	return sysfs_emit(buf, "css:t%01X\n", sch->st);
 }
 
 static DEVICE_ATTR_RO(modalias);
@@ -345,7 +345,7 @@ static ssize_t driver_override_show(struct device *dev,
 	ssize_t len;
 
 	device_lock(dev);
-	len = snprintf(buf, PAGE_SIZE, "%s\n", sch->driver_override);
+	len = sysfs_emit(buf, "%s\n", sch->driver_override);
 	device_unlock(dev);
 	return len;
 }
@@ -396,7 +396,7 @@ static ssize_t pimpampom_show(struct device *dev,
 	struct subchannel *sch = to_subchannel(dev);
 	struct pmcw *pmcw = &sch->schib.pmcw;
 
-	return sprintf(buf, "%02x %02x %02x\n",
+	return sysfs_emit(buf, "%02x %02x %02x\n",
 		       pmcw->pim, pmcw->pam, pmcw->pom);
 }
 static DEVICE_ATTR_RO(pimpampom);
@@ -881,7 +881,7 @@ static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a,
 	if (!css->id_valid)
 		return -EINVAL;
 
-	return sprintf(buf, "%x\n", css->cssid);
+	return sysfs_emit(buf, "%x\n", css->cssid);
 }
 static DEVICE_ATTR_RO(real_cssid);
 
@@ -904,7 +904,7 @@ static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a,
 	int ret;
 
 	mutex_lock(&css->mutex);
-	ret = sprintf(buf, "%x\n", css->cm_enabled);
+	ret = sysfs_emit(buf, "%x\n", css->cm_enabled);
 	mutex_unlock(&css->mutex);
 	return ret;
 }
-- 
2.29.2