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    SubjectRe: [patch 14/71] USB: EHCI: use the new clear_tt_buffer interface
    On Tue, 28 Jul 2009, Greg KH wrote:

    > 2.6.30-stable review patch. If anyone has any objections, please let us know.
    >
    > ------------------
    >
    > From: Alan Stern <stern@rowland.harvard.edu>
    >
    > commit 914b701280a76f96890ad63eb0fa99bf204b961c upstream.
    >
    > This patch (as1256) changes ehci-hcd and all the other drivers in the
    > EHCI family to make use of the new clear_tt_buffer callbacks. When a
    > Clear-TT-Buffer request is in progress for a QH, the QH is not allowed
    > to be linked into the async schedule until the request is finished.
    > At that time, if there are any URBs queued for the QH, it is linked
    > into the async schedule.

    Greg, can we hold off on applying this patch to the stable tree?

    It turns out that this change causes a WARN_ON to trigger in some
    circumstances, and the proposed patch to fix _that_ hasn't yet been
    submitted to the mainline because a few people have reported that it
    leaks DMA pool memory. So far there hasn't been much progress in
    tracking this down.

    Alan Stern



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