linux-kernel - [PATCH v2 24/25] scsi: scsi_transport_sas: Convert sprintf() family to sysfs

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Date: Tue, 19 Mar 2024 14:31:31 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-scsi@...r.kernel.org
Subject: [PATCH v2 24/25] scsi: scsi_transport_sas: Convert sprintf() family to sysfs_emit() family (part 2)

This focuses on the abused cases in macros.

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() and scnprintf() will be converted as well 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: "James E.J. Bottomley" <jejb@...ux.ibm.com>
CC: "Martin K. Petersen" <martin.petersen@...cle.com>
CC: linux-scsi@...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/scsi/scsi_transport_sas.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index baf2aaf361d2..21d3b13c543a 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -427,7 +427,7 @@ show_sas_phy_##name(struct device *dev, 				\
 {									\
 	struct sas_phy *phy = transport_class_to_phy(dev);		\
 									\
-	return snprintf(buf, 20, format_string, cast phy->field);	\
+	return sysfs_emit(buf, format_string, cast phy->field);		\
 }
 
 #define sas_phy_simple_attr(field, name, format_string, type)		\
@@ -442,7 +442,7 @@ show_sas_phy_##name(struct device *dev, 				\
 	struct sas_phy *phy = transport_class_to_phy(dev);		\
 									\
 	if (!phy->field)						\
-		return snprintf(buf, 20, "none\n");			\
+		return sysfs_emit(buf, "none\n");			\
 	return get_sas_protocol_names(phy->field, buf);		\
 }
 
@@ -507,7 +507,7 @@ show_sas_phy_##field(struct device *dev, 				\
 	error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
 	if (error)							\
 		return error;						\
-	return snprintf(buf, 20, "%u\n", phy->field);			\
+	return sysfs_emit(buf, "%u\n", phy->field);			\
 }
 
 #define sas_phy_linkerror_attr(field)					\
@@ -798,7 +798,7 @@ show_sas_port_##name(struct device *dev, 				\
 {									\
 	struct sas_port *port = transport_class_to_sas_port(dev);	\
 									\
-	return snprintf(buf, 20, format_string, cast port->field);	\
+	return sysfs_emit(buf, format_string, cast port->field);	\
 }
 
 #define sas_port_simple_attr(field, name, format_string, type)		\
@@ -1145,7 +1145,7 @@ show_sas_rphy_##name(struct device *dev, 				\
 {									\
 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
 									\
-	return snprintf(buf, 20, format_string, cast rphy->field);	\
+	return sysfs_emit(buf, format_string, cast rphy->field);	\
 }
 
 #define sas_rphy_simple_attr(field, name, format_string, type)		\
@@ -1161,7 +1161,7 @@ show_sas_rphy_##name(struct device *dev, 				\
 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
 									\
 	if (!rphy->field)					\
-		return snprintf(buf, 20, "none\n");			\
+		return sysfs_emit(buf, "none\n");			\
 	return get_sas_protocol_names(rphy->field, buf);	\
 }
 
@@ -1280,7 +1280,7 @@ show_sas_end_dev_##name(struct device *dev, 				\
 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
 	struct sas_end_device *rdev = rphy_to_end_device(rphy);		\
 									\
-	return snprintf(buf, 20, format_string, cast rdev->field);	\
+	return sysfs_emit(buf, format_string, cast rdev->field);	\
 }
 
 #define sas_end_dev_simple_attr(field, name, format_string, type)	\
@@ -1309,7 +1309,7 @@ show_sas_expander_##name(struct device *dev, 				\
 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
 	struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
 									\
-	return snprintf(buf, 20, format_string, cast edev->field);	\
+	return sysfs_emit(buf, format_string, cast edev->field);	\
 }
 
 #define sas_expander_simple_attr(field, name, format_string, type)	\
-- 
2.29.2