Re: [patch]missing error check in probing

[Oliver Neukum <oliver@xxxxxxxxxx>]

Am Donnerstag, 27. August 2009 16:11:10 schrieb Alan Stern:
> Minor problem: You omitted the usb_autosuspend_device() call from the
> error path.  Once that is fixed you can add
>

Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>

commit 69485fa99ec0d71a5604819aaa0df16de44f0447
Author: Oliver Neukum <oliver@xxxxxxxxxx>
Date:   Thu Aug 27 16:41:25 2009 +0200

    usb: check for IO errors usb_set_interface can return
    
    if they happen while unbinding a flag is set to retry upon probe
    if they happen during probe they are handled as probe errors

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 69e5773..76d7d4b 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -236,24 +236,31 @@ static int usb_probe_interface(struct device *dev)
 
 		/* Carry out a deferred switch to altsetting 0 */
 		if (intf->needs_altsetting0) {
-			usb_set_interface(udev, intf->altsetting[0].
+			error = usb_set_interface(udev, intf->altsetting[0].
 					desc.bInterfaceNumber, 0);
+			if (error < 0)
+				goto err;
+
 			intf->needs_altsetting0 = 0;
 		}
 
 		error = driver->probe(intf, id);
-		if (error) {
-			mark_quiesced(intf);
-			intf->needs_remote_wakeup = 0;
-			intf->condition = USB_INTERFACE_UNBOUND;
-			usb_cancel_queued_reset(intf);
-		} else
-			intf->condition = USB_INTERFACE_BOUND;
+		if (error)
+			goto err;
 
+		intf->condition = USB_INTERFACE_BOUND;
 		usb_autosuspend_device(udev);
 	}
 
 	return error;
+
+err:
+	mark_quiesced(intf);
+	intf->needs_remote_wakeup = 0;
+	intf->condition = USB_INTERFACE_UNBOUND;
+	usb_cancel_queued_reset(intf);
+	usb_autosuspend_device(udev);
+	return error;
 }
 
 /* called from driver core with dev locked */
@@ -262,7 +269,7 @@ static int usb_unbind_interface(struct device *dev)
 	struct usb_driver *driver = to_usb_driver(dev->driver);
 	struct usb_interface *intf = to_usb_interface(dev);
 	struct usb_device *udev;
-	int error;
+	int error, r;
 
 	intf->condition = USB_INTERFACE_UNBINDING;
 
@@ -290,11 +297,14 @@ static int usb_unbind_interface(struct device *dev)
 		 * Just re-enable it without affecting the endpoint toggles.
 		 */
 		usb_enable_interface(udev, intf, false);
-	} else if (!error && intf->dev.power.status == DPM_ON)
-		usb_set_interface(udev, intf->altsetting[0].
+	} else if (!error && intf->dev.power.status == DPM_ON) {
+		r = usb_set_interface(udev, intf->altsetting[0].
 				desc.bInterfaceNumber, 0);
-	else
+		if (r < 0)
+			intf->needs_altsetting0 = 1;
+	} else {
 		intf->needs_altsetting0 = 1;
+	}
 	usb_set_intfdata(intf, NULL);
 
 	intf->condition = USB_INTERFACE_UNBOUND;

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