misc: alcor_pci: Fix an error handling path

A successful ida_simple_get() should be balanced by a corresponding
ida_simple_remove().

Add the missing call in the error handling path of the probe.

While at it, switch to ida_alloc()/ida_free() instead to
ida_simple_get()/ida_simple_remove().
The latter is deprecated and more verbose.

Fixes: 4f556bc0 ("misc: cardreader: add new Alcor Micro Cardreader PCI driver")
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/918a9875b7f67b7f8f123c4446452603422e8c5e.1644136776.git.christophe.jaillet@wanadoo.frSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/cardreader/alcor_pci.c

@@ -266,7 +266,7 @@ static int alcor_pci_probe(struct pci_dev *pdev,
 	if (!priv)
 		return -ENOMEM;
 
-	ret = ida_simple_get(&alcor_pci_idr, 0, 0, GFP_KERNEL);
+	ret = ida_alloc(&alcor_pci_idr, GFP_KERNEL);
 	if (ret < 0)
 		return ret;
 	priv->id = ret;
@@ -280,7 +280,8 @@ static int alcor_pci_probe(struct pci_dev *pdev,
 	ret = pci_request_regions(pdev, DRV_NAME_ALCOR_PCI);
 	if (ret) {
 		dev_err(&pdev->dev, "Cannot request region\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto error_free_ida;
 	}
 
 	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
@@ -324,6 +325,8 @@ static int alcor_pci_probe(struct pci_dev *pdev,
 
 error_release_regions:
 	pci_release_regions(pdev);
+error_free_ida:
+	ida_free(&alcor_pci_idr, priv->id);
 	return ret;
 }
 
@@ -337,7 +340,7 @@ static void alcor_pci_remove(struct pci_dev *pdev)
 
 	mfd_remove_devices(&pdev->dev);
 
-	ida_simple_remove(&alcor_pci_idr, priv->id);
+	ida_free(&alcor_pci_idr, priv->id);
 
 	pci_release_regions(pdev);
 	pci_set_drvdata(pdev, NULL);