[PATCH] soc: aspeed: xdma: Return -EFAULT if copy_from_user() fails

[Dan Carpenter]

The copy_from_user() function returns the number of bytes remaining
which we weren't able to copy.  This should return -EFAULT to the
user.

Fixes: 86609baa4217 ("soc: aspeed: xdma: Add user interface")
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
---
 drivers/soc/aspeed/aspeed-xdma.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/aspeed/aspeed-xdma.c b/drivers/soc/aspeed/aspeed-xdma.c
index 91b51a3de8df..e6b4744bda64 100644
--- a/drivers/soc/aspeed/aspeed-xdma.c
+++ b/drivers/soc/aspeed/aspeed-xdma.c
@@ -569,9 +569,8 @@ static ssize_t aspeed_xdma_write(struct file *file, const char __user *buf,
 	if (len != sizeof(op))
 		return -EINVAL;
 
-	rc = copy_from_user(&op, buf, len);
-	if (rc)
-		return rc;
+	if (copy_from_user(&op, buf, len))
+		return -EFAULT;
 
 	if (!op.len || op.len > client->size ||
 	    op.direction > ASPEED_XDMA_DIRECTION_UPSTREAM)
-- 
2.28.0