mlx5: Return -EFAULT instead of -EPERM

For copy_to/from_user() failure, the correct error code is -EFAULT not
-EPERM.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/mlx5/mr.c

@@ -171,7 +171,7 @@ static ssize_t size_write(struct file *filp, const char __user *buf,
 	int c;
 
 	if (copy_from_user(lbuf, buf, sizeof(lbuf)))
-		return -EPERM;
+		return -EFAULT;
 
 	c = order2idx(dev, ent->order);
 	lbuf[sizeof(lbuf) - 1] = 0;
@@ -208,7 +208,7 @@ static ssize_t size_read(struct file *filp, char __user *buf, size_t count,
 		return err;
 
 	if (copy_to_user(buf, lbuf, err))
-		return -EPERM;
+		return -EFAULT;
 
 	*pos += err;
 
@@ -233,7 +233,7 @@ static ssize_t limit_write(struct file *filp, const char __user *buf,
 	int c;
 
 	if (copy_from_user(lbuf, buf, sizeof(lbuf)))
-		return -EPERM;
+		return -EFAULT;
 
 	c = order2idx(dev, ent->order);
 	lbuf[sizeof(lbuf) - 1] = 0;
@@ -270,7 +270,7 @@ static ssize_t limit_read(struct file *filp, char __user *buf, size_t count,
 		return err;
 
 	if (copy_to_user(buf, lbuf, err))
-		return -EPERM;
+		return -EFAULT;
 
 	*pos += err;
 

drivers/net/ethernet/mellanox/mlx5/core/cmd.c

@@ -693,7 +693,7 @@ static ssize_t dbg_write(struct file *filp, const char __user *buf,
 		return -ENOMEM;
 
 	if (copy_from_user(lbuf, buf, sizeof(lbuf)))
-		return -EPERM;
+		return -EFAULT;
 
 	lbuf[sizeof(lbuf) - 1] = 0;
 
@@ -889,7 +889,7 @@ static ssize_t data_write(struct file *filp, const char __user *buf,
 		return -ENOMEM;
 
 	if (copy_from_user(ptr, buf, count)) {
-		err = -EPERM;
+		err = -EFAULT;
 		goto out;
 	}
 	dbg->in_msg = ptr;
@@ -919,7 +919,7 @@ static ssize_t data_read(struct file *filp, char __user *buf, size_t count,
 
 	copy = min_t(int, count, dbg->outlen);
 	if (copy_to_user(buf, dbg->out_msg, copy))
-		return -EPERM;
+		return -EFAULT;
 
 	*pos += copy;
 
@@ -949,7 +949,7 @@ static ssize_t outlen_read(struct file *filp, char __user *buf, size_t count,
 		return err;
 
 	if (copy_to_user(buf, &outlen, err))
-		return -EPERM;
+		return -EFAULT;
 
 	*pos += err;
 
@@ -974,7 +974,7 @@ static ssize_t outlen_write(struct file *filp, const char __user *buf,
 	dbg->outlen = 0;
 
 	if (copy_from_user(outlen_str, buf, count))
-		return -EPERM;
+		return -EFAULT;
 
 	outlen_str[7] = 0;
 

drivers/net/ethernet/mellanox/mlx5/core/debugfs.c

@@ -148,7 +148,6 @@ static ssize_t average_read(struct file *filp, char __user *buf, size_t count,
 	struct mlx5_cmd_stats *stats;
 	u64 field = 0;
 	int ret;
-	int err;
 	char tbuf[22];
 
 	if (*pos)
@@ -161,9 +160,8 @@ static ssize_t average_read(struct file *filp, char __user *buf, size_t count,
 	spin_unlock(&stats->lock);
 	ret = snprintf(tbuf, sizeof(tbuf), "%llu\n", field);
 	if (ret > 0) {
-		err = copy_to_user(buf, tbuf, ret);
-		if (err)
-			return err;
+		if (copy_to_user(buf, tbuf, ret))
+			return -EFAULT;
 	}
 
 	*pos += ret;
@@ -418,7 +416,6 @@ static ssize_t dbg_read(struct file *filp, char __user *buf, size_t count,
 	char tbuf[18];
 	u64 field;
 	int ret;
-	int err;
 
 	if (*pos)
 		return 0;
@@ -445,9 +442,8 @@ static ssize_t dbg_read(struct file *filp, char __user *buf, size_t count,
 
 	ret = snprintf(tbuf, sizeof(tbuf), "0x%llx\n", field);
 	if (ret > 0) {
-		err = copy_to_user(buf, tbuf, ret);
-		if (err)
-			return err;
+		if (copy_to_user(buf, tbuf, ret))
+			return -EFAULT;
 	}
 
 	*pos += ret;