On Mon, 25 Mar 2013, David Linares wrote: > Hi all, > > I am currently working on an open-source project using linux 3.5.4 on > an i.MX25 board manufactured by Voipac. > I have been experiencing all sorts of USB issues that I have logged here: > http://pastebin.com/Ry6fdne5 > As you will see, it varies from detecting a hub with 0 ports, failing > to initialise it or failing to mount a USB dongle attached to it. > After trying to get some help on KernelNewbies, I was advised to find > the consequence of the NULL pointer dereference (bullet point 1 from > pastebin link), which I did. I posted my first patch earlier "[PATCH] > USB: hub: Avoid NULL pointer dereference when hub doesn't have any > ports". > > Now, I would like to get to the root cause/causes of these issues but > I would need your help. For example, I have no idea if a source not > delivering enough power could potentially lead to these kinds of > errors. Certainly it could. > Any help or advice on ways to carry on my investigation would be > gratefully received. Start with usbmon (see Documentation/usb/usbmon.txt). Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
