diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2012-07-11 11:22:26 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 16:54:25 -0700 |
| commit | df2022553dd8d34d49e16c19d851ea619438f0ef (patch) | |
| tree | 9850c967e0fbee1cb99e900c2e60a0ad50b528da /drivers/usb/host/ehci-hub.c | |
| parent | 314466101c6ae14f6f5db8a86eda1509ba2c02a8 (diff) | |
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/host/ehci-hub.c')
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index 25329e4b844..8aa740dc510 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -302,6 +302,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) if (ehci->async_unlink) end_unlink_async(ehci); + ehci_handle_intr_unlinks(ehci); /* allow remote wakeup */ mask = INTR_MASK; |