diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2016-01-25 15:44:16 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-03 13:14:52 -0800 |
| commit | f96fba0dbf8f6b0eaa313b4c230f93c9bb0dd759 (patch) | |
| tree | 71a582d57c0b91863595d06c8008b5debb05d219 /drivers/usb/host/ehci-hcd.c | |
| parent | fcc5184ec1521c7d85124421e593660c94e9a9fb (diff) | |
USB: EHCI: improve handling of the ehci->iaa_in_progress flag
This patch improves the way ehci-hcd handles the iaa_in_progress flag.
The current code is somewhat careless in this regard:
The flag is meaningless when the root hub isn't running, most
particularly after the root hub has been suspended. But in
start_iaa_cycle(), the driver checks the flag before checking
the root hub's state. They should be checked in the opposite
order.
That routine also sets the flag too early, before it has
definitely committed to starting an IAA cycle.
The flag is turned off in end_unlink_async(). Upcoming
changes will call that routine at other times, not just at the
end of an IAA cycle. The two actions are logically separate
(although related), so we separate out a new routine to be
called in place of end_unlink_async() whenever an IAA cycle
ends: end_iaa_cycle().
iaa_in_progress should be turned off when the root hub is
suspended -- we certainly don't want it still to be set when
the root hub resumes. Therefore the call to
end_unlink_async() in ehci_bus_suspend() should also be
replaced with a call to end_iaa_cycle().
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-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index c5465bf9a798..84c41262109c 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -306,6 +306,7 @@ static void ehci_quiesce (struct ehci_hcd *ehci) /*-------------------------------------------------------------------------*/ +static void end_iaa_cycle(struct ehci_hcd *ehci); static void end_unlink_async(struct ehci_hcd *ehci); static void unlink_empty_async(struct ehci_hcd *ehci); static void unlink_empty_async_suspended(struct ehci_hcd *ehci); @@ -758,7 +759,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) ehci_dbg(ehci, "IAA with IAAD still set?\n"); if (ehci->iaa_in_progress) COUNT(ehci->stats.iaa); - end_unlink_async(ehci); + end_iaa_cycle(ehci); } /* remote wakeup [4.3.1] */ |