linux-kernel - [PATCH 2/5] s390/sclp_config: use BIN_ATTR_ADMIN_WO() for bin

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Message-Id: <20241202-sysfs-const-bin_attr-admin_wo-v1-2-f489116210bf@weissschuh.net>
Date: Mon, 02 Dec 2024 20:00:37 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: 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>, Michael Ellerman <mpe@...erman.id.au>, 
 Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>, Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Tzung-Bi Shih <tzungbi@...nel.org>, Brian Norris <briannorris@...omium.org>, 
 Julius Werner <jwerner@...omium.org>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org, 
 linuxppc-dev@...ts.ozlabs.org, chrome-platform@...ts.linux.dev, 
 linux-scsi@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 2/5] s390/sclp_config: use BIN_ATTR_ADMIN_WO() for
 bin_attribute definition

Using the macro saves some lines of code and prepares the attribute for
the general constifications of struct bin_attributes.

While at it also constify the callback parameter.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/s390/char/sclp_config.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
index f56ea9b60e08e817652a9b7d19d420e9977c6552..0fe0782ccd325c1c3907e5d6272f770477e9ea46 100644
--- a/drivers/s390/char/sclp_config.c
+++ b/drivers/s390/char/sclp_config.c
@@ -127,9 +127,9 @@ static int sclp_ofb_send_req(char *ev_data, size_t len)
 	return rc;
 }

-static ssize_t sysfs_ofb_data_write(struct file *filp, struct kobject *kobj,
-				    struct bin_attribute *bin_attr,
-				    char *buf, loff_t off, size_t count)
+static ssize_t event_data_write(struct file *filp, struct kobject *kobj,
+				const struct bin_attribute *bin_attr,
+				char *buf, loff_t off, size_t count)
 {
 	int rc;

@@ -137,13 +137,7 @@ static ssize_t sysfs_ofb_data_write(struct file *filp, struct kobject *kobj,
 	return rc ?: count;
 }

-static const struct bin_attribute ofb_bin_attr = {
-	.attr = {
-		.name = "event_data",
-		.mode = S_IWUSR,
-	},
-	.write = sysfs_ofb_data_write,
-};
+static const BIN_ATTR_ADMIN_WO(event_data, 0);
 #endif

 static int __init sclp_ofb_setup(void)
@@ -155,7 +149,7 @@ static int __init sclp_ofb_setup(void)
 	ofb_kset = kset_create_and_add("ofb", NULL, firmware_kobj);
 	if (!ofb_kset)
 		return -ENOMEM;
-	rc = sysfs_create_bin_file(&ofb_kset->kobj, &ofb_bin_attr);
+	rc = sysfs_create_bin_file(&ofb_kset->kobj, &bin_attr_event_data);
 	if (rc) {
 		kset_unregister(ofb_kset);
 		return rc;

-- 
2.47.1