Bluetooth: btusb: Fix new sparce warnings

This fix the following warnings detect with make W=1 C=1:

drivers/bluetooth/btusb.c:2212:9: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2212:9: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2245:18: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2249:18: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2253:18: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2257:18: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2261:18: warning: cast to restricted __le16
drivers/bluetooth/btusb.c:2267:18: warning: cast to restricted __le16
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

drivers/bluetooth/btusb.c

@@ -2201,17 +2201,18 @@ static int btusb_setup_csr(struct hci_dev *hdev)
 		return err;
 	}
 
-	if (skb->len != sizeof(struct hci_rp_read_local_version)) {
+	rp = skb_pull_data(skb, sizeof(*rp));
+	if (!rp) {
 		bt_dev_err(hdev, "CSR: Local version length mismatch");
 		kfree_skb(skb);
 		return -EIO;
 	}
 
-	rp = (struct hci_rp_read_local_version *)skb->data;
+	bt_dev_info(hdev, "CSR: Setting up dongle with HCI ver=%u rev=%04x",
+		    rp->hci_ver, le16_to_cpu(rp->hci_rev));
 
-	bt_dev_info(hdev, "CSR: Setting up dongle with HCI ver=%u rev=%04x; LMP ver=%u subver=%04x; manufacturer=%u",
-		le16_to_cpu(rp->hci_ver), le16_to_cpu(rp->hci_rev),
-		le16_to_cpu(rp->lmp_ver), le16_to_cpu(rp->lmp_subver),
+	bt_dev_info(hdev, "LMP ver=%u subver=%04x; manufacturer=%u",
+		    rp->lmp_ver, le16_to_cpu(rp->lmp_subver),
 		    le16_to_cpu(rp->manufacturer));
 
 	/* Detect a wide host of Chinese controllers that aren't CSR.
@@ -2242,29 +2243,29 @@ static int btusb_setup_csr(struct hci_dev *hdev)
 	 *      third-party BT 4.0 dongle reuses it.
 	 */
 	else if (le16_to_cpu(rp->lmp_subver) <= 0x034e &&
-		 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_1_1)
+		 rp->hci_ver > BLUETOOTH_VER_1_1)
 		is_fake = true;
 
 	else if (le16_to_cpu(rp->lmp_subver) <= 0x0529 &&
-		 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_1_2)
+		 rp->hci_ver > BLUETOOTH_VER_1_2)
 		is_fake = true;
 
 	else if (le16_to_cpu(rp->lmp_subver) <= 0x0c5c &&
-		 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_2_0)
+		 rp->hci_ver > BLUETOOTH_VER_2_0)
 		is_fake = true;
 
 	else if (le16_to_cpu(rp->lmp_subver) <= 0x1899 &&
-		 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_2_1)
+		 rp->hci_ver > BLUETOOTH_VER_2_1)
 		is_fake = true;
 
 	else if (le16_to_cpu(rp->lmp_subver) <= 0x22bb &&
-		 le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_4_0)
+		 rp->hci_ver > BLUETOOTH_VER_4_0)
 		is_fake = true;
 
 	/* Other clones which beat all the above checks */
 	else if (bcdDevice == 0x0134 &&
 		 le16_to_cpu(rp->lmp_subver) == 0x0c5c &&
-		 le16_to_cpu(rp->hci_ver) == BLUETOOTH_VER_2_0)
+		 rp->hci_ver == BLUETOOTH_VER_2_0)
 		is_fake = true;
 
 	if (is_fake) {