From: Gerd Luyten <gluyten@skynet.be>
To: linux-kernel@vger.kernel.org
Subject: [PATCH] usbcore, kernel 2.6.18.1
Date: Thu, 03 Apr 2008 15:14:54 +0200 [thread overview]
Message-ID: <1207228494.8542.9.camel@workstation.dyn.nu> (raw)
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@workstation 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@skynet.be>
next reply other threads:[~2008-04-03 13:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-03 13:14 Gerd Luyten [this message]
2008-04-04 4:34 ` Andrew Morton
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