On Sun, May 20, 2012 at 05:23:38PM -0700, ber...@plugable.com wrote: > From: Bernie Thompson <ber...@plugable.com> > > This is a request to backport a 3.4 udlfb driver patch to 3.3.* > > Existing upstream (3.4) commit ID: 8d21547d3c9c3bc653261f26d554cfabc4a083de > > This patch fixes a critical panic (in hcd_buffer_free) with unplug/replug > of USB graphics devices. Prior to this patch, were doing too much in USB > probe(), including starting big transfers to paint the screen of the USB > graphics device. This both was triggering race conditions with disconnect() > and teardown. and probably holding up USB enumeration generally. With this > patch, probe() and disconnect() do the minimum necessary, and move longer > device-specific steps to delayed work. > > The race condition that this patch fixes has turned out to be more frequent > than originally realized. This patch is effectively required for stable USB > multiseat support (e.g. in Fedora 17). > > This patch is a little longer than the 100 line guideline (81+ 66-), because > of the need to move some lines. > > This patch has been in use since 3.4rc1 and has proven both to have fixed the > original issue, and have no known side effects. It generally improves the > stability of DisplayLink USB graphics devices on Linux. > > It should apply to 3.3.* cleanly, as there aren't significant intervening > patches. > It has no pre-requisites for 3.3.6+
Looks good, now applied to the 3.3-stable tree, thanks. greg k-h -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
