From: Alan Stern Date: Mon, 19 Feb 2007 20:52:45 +0000 (-0500) Subject: UHCI: Eliminate asynchronous skeleton Queue Headers X-Git-Tag: v2.6.21-rc2~45^2~11 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17230acdc71137622ca7dfd789b3944c75d39404;p=pandora-kernel.git UHCI: Eliminate asynchronous skeleton Queue Headers This patch (as856) attempts to improve the performance of uhci-hcd by removing the asynchronous skeleton Queue Headers. They don't contain any useful information but the controller has to read through them at least once every millisecond, incurring a non-zero DMA overhead. Now all the asynchronous queues are combined, along with the period-1 interrupt queue, into a single list with a single skeleton QH. The start of the low-speed control, full-speed control, and bulk sublists is determined by linear search. Since there should rarely be more than a couple of QHs in the list, the searches should incur a much smaller total load than keeping the skeleton QHs. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed