bnx2: don't request firmware when there's no userspace.

The firmware is cached during the first successful call to open() and
released once the network device is unregistered. The driver uses the
cached firmware between open() and unregister_netdev().

It's similar to 953a12cc2889d1be92e80a2d0bab5ffef4942300 but the
firmware is mandatory.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2.c

@@ -3623,7 +3623,7 @@ bnx2_set_rx_mode(struct net_device *dev)
 	spin_unlock_bh(&bp->phy_lock);
 }
 
-static int __devinit
+static int
 check_fw_section(const struct firmware *fw,
 		 const struct bnx2_fw_file_section *section,
 		 u32 alignment, bool non_empty)
@@ -3639,7 +3639,7 @@ check_fw_section(const struct firmware *fw,
 	return 0;
 }
 
-static int __devinit
+static int
 check_mips_fw_entry(const struct firmware *fw,
 		    const struct bnx2_mips_fw_file_entry *entry)
 {
@@ -3650,8 +3650,16 @@ check_mips_fw_entry(const struct firmware *fw,
 	return 0;
 }
 
-static int __devinit
-bnx2_request_firmware(struct bnx2 *bp)
+static void bnx2_release_firmware(struct bnx2 *bp)
+{
+	if (bp->rv2p_firmware) {
+		release_firmware(bp->mips_firmware);
+		release_firmware(bp->rv2p_firmware);
+		bp->rv2p_firmware = NULL;
+	}
+}
+
+static int bnx2_request_uncached_firmware(struct bnx2 *bp)
 {
 	const char *mips_fw_file, *rv2p_fw_file;
 	const struct bnx2_mips_fw_file *mips_fw;
@@ -3673,13 +3681,13 @@ bnx2_request_firmware(struct bnx2 *bp)
 	rc = request_firmware(&bp->mips_firmware, mips_fw_file, &bp->pdev->dev);
 	if (rc) {
 		pr_err("Can't load firmware file \"%s\"\n", mips_fw_file);
-		return rc;
+		goto out;
 	}
 
 	rc = request_firmware(&bp->rv2p_firmware, rv2p_fw_file, &bp->pdev->dev);
 	if (rc) {
 		pr_err("Can't load firmware file \"%s\"\n", rv2p_fw_file);
-		return rc;
+		goto err_release_mips_firmware;
 	}
 	mips_fw = (const struct bnx2_mips_fw_file *) bp->mips_firmware->data;
 	rv2p_fw = (const struct bnx2_rv2p_fw_file *) bp->rv2p_firmware->data;
@@ -3690,16 +3698,30 @@ bnx2_request_firmware(struct bnx2 *bp)
 	    check_mips_fw_entry(bp->mips_firmware, &mips_fw->tpat) ||
 	    check_mips_fw_entry(bp->mips_firmware, &mips_fw->txp)) {
 		pr_err("Firmware file \"%s\" is invalid\n", mips_fw_file);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto err_release_firmware;
 	}
 	if (bp->rv2p_firmware->size < sizeof(*rv2p_fw) ||
 	    check_fw_section(bp->rv2p_firmware, &rv2p_fw->proc1.rv2p, 8, true) ||
 	    check_fw_section(bp->rv2p_firmware, &rv2p_fw->proc2.rv2p, 8, true)) {
 		pr_err("Firmware file \"%s\" is invalid\n", rv2p_fw_file);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto err_release_firmware;
 	}
+out:
+	return rc;
 
-	return 0;
+err_release_firmware:
+	release_firmware(bp->rv2p_firmware);
+	bp->rv2p_firmware = NULL;
+err_release_mips_firmware:
+	release_firmware(bp->mips_firmware);
+	goto out;
+}
+
+static int bnx2_request_firmware(struct bnx2 *bp)
+{
+	return bp->rv2p_firmware ? 0 : bnx2_request_uncached_firmware(bp);
 }
 
 static u32
@@ -6267,6 +6289,10 @@ bnx2_open(struct net_device *dev)
 	struct bnx2 *bp = netdev_priv(dev);
 	int rc;
 
+	rc = bnx2_request_firmware(bp);
+	if (rc < 0)
+		goto out;
+
 	netif_carrier_off(dev);
 
 	bnx2_set_power_state(bp, PCI_D0);
@@ -6327,8 +6353,8 @@ bnx2_open(struct net_device *dev)
 		netdev_info(dev, "using MSIX\n");
 
 	netif_tx_start_all_queues(dev);
-
-	return 0;
+out:
+	return rc;
 
 open_err:
 	bnx2_napi_disable(bp);
@@ -6336,7 +6362,8 @@ open_err:
 	bnx2_free_irq(bp);
 	bnx2_free_mem(bp);
 	bnx2_del_napi(bp);
-	return rc;
+	bnx2_release_firmware(bp);
+	goto out;
 }
 
 static void
@@ -8354,10 +8381,6 @@ bnx2_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	pci_set_drvdata(pdev, dev);
 
-	rc = bnx2_request_firmware(bp);
-	if (rc)
-		goto error;
-
 	memcpy(dev->dev_addr, bp->mac_addr, 6);
 	memcpy(dev->perm_addr, bp->mac_addr, 6);
 
@@ -8389,11 +8412,6 @@ bnx2_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	return 0;
 
 error:
-	if (bp->mips_firmware)
-		release_firmware(bp->mips_firmware);
-	if (bp->rv2p_firmware)
-		release_firmware(bp->rv2p_firmware);
-
 	if (bp->regview)
 		iounmap(bp->regview);
 	pci_release_regions(pdev);
@@ -8414,11 +8432,6 @@ bnx2_remove_one(struct pci_dev *pdev)
 	del_timer_sync(&bp->timer);
 	cancel_work_sync(&bp->reset_task);
 
-	if (bp->mips_firmware)
-		release_firmware(bp->mips_firmware);
-	if (bp->rv2p_firmware)
-		release_firmware(bp->rv2p_firmware);
-
 	if (bp->regview)
 		iounmap(bp->regview);
 
@@ -8429,6 +8442,8 @@ bnx2_remove_one(struct pci_dev *pdev)
 		bp->flags &= ~BNX2_FLAG_AER_ENABLED;
 	}
 
+	bnx2_release_firmware(bp);
+
 	free_netdev(dev);
 
 	pci_release_regions(pdev);