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authorBjorn Andersson <bjorn.andersson@linaro.org>2018-08-07 00:14:24 -0700
committerManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2018-11-02 16:18:26 +0530
commit549c6824d95daa01735bdabcca16defbcdeabbcf (patch)
tree3af3df3081dfe91c8644cd1b01cb2e895b4e7c29
parent929e134c43c95822663367c47fb211ca272309f7 (diff)
download96b-common-549c6824d95daa01735bdabcca16defbcdeabbcf.tar.gz
rpmsg: char: Migrate to iter versions of read and write
In order to be able to use the aio interface for writing to a rpmsg_char the write_iter function must be implemented, so migrate to iter version for read and write functions. Regular read and write uses the iter methods if present and is as such unaffected. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
-rw-r--r--drivers/rpmsg/rpmsg_char.c27
1 files changed, 16 insertions, 11 deletions
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index a76b963a7e50..eea5ebbb5119 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -167,9 +167,9 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
return 0;
}
-static ssize_t rpmsg_eptdev_read(struct file *filp, char __user *buf,
- size_t len, loff_t *f_pos)
+static ssize_t rpmsg_eptdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
+ struct file *filp = iocb->ki_filp;
struct rpmsg_eptdev *eptdev = filp->private_data;
unsigned long flags;
struct sk_buff *skb;
@@ -205,8 +205,8 @@ static ssize_t rpmsg_eptdev_read(struct file *filp, char __user *buf,
if (!skb)
return -EFAULT;
- use = min_t(size_t, len, skb->len);
- if (copy_to_user(buf, skb->data, use))
+ use = min_t(size_t, iov_iter_count(to), skb->len);
+ if (copy_to_iter(skb->data, use, to) != use)
use = -EFAULT;
kfree_skb(skb);
@@ -214,16 +214,21 @@ static ssize_t rpmsg_eptdev_read(struct file *filp, char __user *buf,
return use;
}
-static ssize_t rpmsg_eptdev_write(struct file *filp, const char __user *buf,
- size_t len, loff_t *f_pos)
+static ssize_t rpmsg_eptdev_write_iter(struct kiocb *iocb,
+ struct iov_iter *from)
{
+ struct file *filp = iocb->ki_filp;
struct rpmsg_eptdev *eptdev = filp->private_data;
+ size_t len = iov_iter_count(from);
void *kbuf;
int ret;
- kbuf = memdup_user(buf, len);
- if (IS_ERR(kbuf))
- return PTR_ERR(kbuf);
+ kbuf = kzalloc(len, GFP_KERNEL);
+ if (!kbuf)
+ return -ENOMEM;
+
+ if (!copy_from_iter_full(kbuf, len, from))
+ return -EFAULT;
if (mutex_lock_interruptible(&eptdev->ept_lock)) {
ret = -ERESTARTSYS;
@@ -281,8 +286,8 @@ static const struct file_operations rpmsg_eptdev_fops = {
.owner = THIS_MODULE,
.open = rpmsg_eptdev_open,
.release = rpmsg_eptdev_release,
- .read = rpmsg_eptdev_read,
- .write = rpmsg_eptdev_write,
+ .read_iter = rpmsg_eptdev_read_iter,
+ .write_iter = rpmsg_eptdev_write_iter,
.poll = rpmsg_eptdev_poll,
.unlocked_ioctl = rpmsg_eptdev_ioctl,
.compat_ioctl = rpmsg_eptdev_ioctl,