linux-kernel - [PATCH] usbcore, kernel 2.6.18.1

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Message-Id: <1207228494.8542.9.camel@workstation.dyn.nu>
Date:	Thu, 03 Apr 2008 15:14:54 +0200
From:	Gerd Luyten <gluyten@...net.be>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] usbcore, kernel 2.6.18.1

This patch is to eventually detect a Velleman K8055 USB device.
Without the patch it will fail detection with following errors:
usb 1-2: can't read configurations, error -110
=> probably because of usb non-conformance reason of the K8055 card.
(timing issues...)

With this patch, detection will keep on trying until usb card gets
recognized.
This patch adds a device reset in the "fail:" sequence instead of just
marking the device state as NOTATTACHED.

[gluyten@...kstation pup214]$ diff -u
linux-2.6.18.1/drivers/usb/core/hub.c hub.c
--- linux-2.6.18.1/drivers/usb/core/hub.c       2006-10-14
05:34:03.000000000 +0200
+++ hub.c       2008-04-03 14:47:49.000000000 +0200
@@ -1450,7 +1450,9 @@
        return 0;

 fail:
-       usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+//     usb_set_device_state(udev, USB_STATE_NOTATTACHED);
+       usb_lock_device_for_reset(udev, NULL);
+       usb_reset_composite_device(udev, NULL);
        return err;
 }

-- 
Gerd Luyten <gluyten@...net.be>

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