linux-kernel - [PATCH 262/437] watchdog: watchdog_dev: convert to read/write iterators

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Message-ID: <20240411153126.16201-263-axboe@kernel.dk>
Date: Thu, 11 Apr 2024 09:16:42 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 262/437] watchdog: watchdog_dev: convert to read/write iterators

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 drivers/watchdog/watchdog_dev.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index e2bd266b1b5b..828141d16264 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -694,10 +694,10 @@ static int watchdog_ioctl_op(struct watchdog_device *wdd, unsigned int cmd,
  *
  * Return: @len if successful, error otherwise.
  */
-static ssize_t watchdog_write(struct file *file, const char __user *data,
-						size_t len, loff_t *ppos)
+static ssize_t watchdog_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct watchdog_core_data *wd_data = file->private_data;
+	struct watchdog_core_data *wd_data = iocb->ki_filp->private_data;
+	size_t len = iov_iter_count(from);
 	struct watchdog_device *wdd;
 	int err;
 	size_t i;
@@ -714,7 +714,7 @@ static ssize_t watchdog_write(struct file *file, const char __user *data,
 
 	/* scan to see whether or not we got the magic character */
 	for (i = 0; i != len; i++) {
-		if (get_user(c, data + i))
+		if (get_iter(c, from))
 			return -EFAULT;
 		if (c == 'V')
 			set_bit(_WDOG_ALLOW_RELEASE, &wd_data->status);
@@ -991,7 +991,7 @@ static int watchdog_release(struct inode *inode, struct file *file)
 
 static const struct file_operations watchdog_fops = {
 	.owner		= THIS_MODULE,
-	.write		= watchdog_write,
+	.write_iter	= watchdog_write,
 	.unlocked_ioctl	= watchdog_ioctl,
 	.compat_ioctl	= compat_ptr_ioctl,
 	.open		= watchdog_open,
-- 
2.43.0