linux-kernel - [PATCH 269/437] watchdog: mixcomwd: convert to read/write iterators

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Message-ID: <20240411153126.16201-270-axboe@kernel.dk>
Date: Thu, 11 Apr 2024 09:16:49 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 269/437] watchdog: mixcomwd: convert to read/write iterators

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

diff --git a/drivers/watchdog/mixcomwd.c b/drivers/watchdog/mixcomwd.c
index d387bad377c4..c980e542c31b 100644
--- a/drivers/watchdog/mixcomwd.c
+++ b/drivers/watchdog/mixcomwd.c
@@ -166,9 +166,10 @@ static int mixcomwd_release(struct inode *inode, struct file *file)
 }
 
 
-static ssize_t mixcomwd_write(struct file *file, const char __user *data,
-						size_t len, loff_t *ppos)
+static ssize_t mixcomwd_write(struct kiocb *iocb, struct iov_iter *from)
 {
+	size_t len = iov_iter_count(from);
+
 	if (len) {
 		if (!nowayout) {
 			size_t i;
@@ -178,7 +179,7 @@ static ssize_t mixcomwd_write(struct file *file, const char __user *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')
 					expect_close = 42;
@@ -225,7 +226,7 @@ static long mixcomwd_ioctl(struct file *file,
 static const struct file_operations mixcomwd_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
-	.write		= mixcomwd_write,
+	.write_iter	= mixcomwd_write,
 	.unlocked_ioctl	= mixcomwd_ioctl,
 	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= mixcomwd_open,
-- 
2.43.0