linux-kernel - [PATCH 268/437] watchdog: m54xx_wdt: convert to read/write iterators

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Message-ID: <20240411153126.16201-269-axboe@kernel.dk>
Date: Thu, 11 Apr 2024 09:16:48 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 268/437] watchdog: m54xx_wdt: convert to read/write iterators

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 drivers/watchdog/m54xx_wdt.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/watchdog/m54xx_wdt.c b/drivers/watchdog/m54xx_wdt.c
index 062ea3e6497e..1421e305ca12 100644
--- a/drivers/watchdog/m54xx_wdt.c
+++ b/drivers/watchdog/m54xx_wdt.c
@@ -87,9 +87,10 @@ static int m54xx_wdt_open(struct inode *inode, struct file *file)
 	return stream_open(inode, file);
 }
 
-static ssize_t m54xx_wdt_write(struct file *file, const char *data,
-						size_t len, loff_t *ppos)
+static ssize_t m54xx_wdt_write(struct kiocb *iocb, struct iov_iter *from)
 {
+	size_t len = iov_iter_count(from);
+
 	if (len) {
 		if (!nowayout) {
 			size_t i;
@@ -99,7 +100,7 @@ static ssize_t m54xx_wdt_write(struct file *file, const char *data,
 			for (i = 0; i != len; i++) {
 				char c;
 
-				if (get_user(c, data + i))
+				if (get_iter(c, from))
 					return -EFAULT;
 				if (c == 'V')
 					set_bit(WDT_OK_TO_CLOSE, &wdt_status);
@@ -180,7 +181,7 @@ static int m54xx_wdt_release(struct inode *inode, struct file *file)
 static const struct file_operations m54xx_wdt_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
-	.write		= m54xx_wdt_write,
+	.write_iter	= m54xx_wdt_write,
 	.unlocked_ioctl	= m54xx_wdt_ioctl,
 	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= m54xx_wdt_open,
-- 
2.43.0