Bluetooth: btusb: Add helper for READ_LOCAL_VERSION command

Multiple codepaths duplicate some simple code to read and
sanity-check local version information. Before I add a couple more
such codepaths, add a helper to reduce duplication.
Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

drivers/bluetooth/btusb.c

@@ -1269,6 +1269,28 @@ static void btusb_waker(struct work_struct *work)
 	usb_autopm_put_interface(data->intf);
 }
 
+static struct sk_buff *btusb_read_local_version(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+
+	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
+			     HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION failed (%ld)",
+		       hdev->name, PTR_ERR(skb));
+		return skb;
+	}
+
+	if (skb->len != sizeof(struct hci_rp_read_local_version)) {
+		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION event length mismatch",
+		       hdev->name);
+		kfree_skb(skb);
+		return ERR_PTR(-EIO);
+	}
+
+	return skb;
+}
+
 static int btusb_setup_bcm92035(struct hci_dev *hdev)
 {
 	struct sk_buff *skb;
@@ -1293,12 +1315,9 @@ static int btusb_setup_csr(struct hci_dev *hdev)
 
 	BT_DBG("%s", hdev->name);
 
-	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
-			     HCI_INIT_TIMEOUT);
-	if (IS_ERR(skb)) {
-		BT_ERR("Reading local version failed (%ld)", -PTR_ERR(skb));
+	skb = btusb_read_local_version(hdev);
+	if (IS_ERR(skb))
 		return -PTR_ERR(skb);
-	}
 
 	rp = (struct hci_rp_read_local_version *)skb->data;
 
@@ -2429,21 +2448,9 @@ static int btusb_setup_bcm_patchram(struct hci_dev *hdev)
 	kfree_skb(skb);
 
 	/* Read Local Version Info */
-	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
-			     HCI_INIT_TIMEOUT);
-	if (IS_ERR(skb)) {
-		ret = PTR_ERR(skb);
-		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION failed (%ld)",
-		       hdev->name, ret);
-		return ret;
-	}
-
-	if (skb->len != sizeof(*ver)) {
-		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION event length mismatch",
-		       hdev->name);
-		kfree_skb(skb);
-		return -EIO;
-	}
+	skb = btusb_read_local_version(hdev);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
 
 	ver = (struct hci_rp_read_local_version *)skb->data;
 	rev = le16_to_cpu(ver->hci_rev);
@@ -2531,20 +2538,9 @@ static int btusb_setup_bcm_patchram(struct hci_dev *hdev)
 	kfree_skb(skb);
 
 	/* Read Local Version Info */
-	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
-			     HCI_INIT_TIMEOUT);
+	skb = btusb_read_local_version(hdev);
 	if (IS_ERR(skb)) {
 		ret = PTR_ERR(skb);
-		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION failed (%ld)",
-		       hdev->name, ret);
-		goto done;
-	}
-
-	if (skb->len != sizeof(*ver)) {
-		BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION event length mismatch",
-		       hdev->name);
-		kfree_skb(skb);
-		ret = -EIO;
 		goto done;
 	}