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| author | Alan Stern | 2012-07-11 17:22:26 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2012-07-17 01:54:25 +0200 |
| commit | df2022553dd8d34d49e16c19d851ea619438f0ef (patch) | |
| tree | 9850c967e0fbee1cb99e900c2e60a0ad50b528da /drivers/usb/core | |
| parent | USB: EHCI: use hrtimer for async schedule (diff) | |
| download | kernel-qcow2-linux-df2022553dd8d34d49e16c19d851ea619438f0ef.tar.gz kernel-qcow2-linux-df2022553dd8d34d49e16c19d851ea619438f0ef.tar.xz kernel-qcow2-linux-df2022553dd8d34d49e16c19d851ea619438f0ef.zip | |
USB: EHCI: use hrtimer for interrupt QH unlink
This patch (as1577) adds hrtimer support for unlinking interrupt QHs
in ehci-hcd. The current code relies on a fixed delay of either 2 or
55 us, which is not always adequate and in any case is totally bogus.
Thanks to internal caching, the EHCI hardware may continue to access
an interrupt QH for more than a millisecond after it has been unlinked.
In fact, the EHCI spec doesn't say how long to wait before using an
unlinked interrupt QH. The patch sets the delay to 9 microframes
minimum, which ought to be adequate.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
0 files changed, 0 insertions, 0 deletions