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| author | Alan Stern <stern@rowland.harvard.edu> | 2016-01-25 15:45:38 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-03 13:14:52 -0800 |
| commit | 8df0d77d8ce065ef536676fb4e1f36bfbf1dd809 (patch) | |
| tree | 7bae7007a118271be114cddab692e94afffd3cc8 /drivers/usb/host/ehci-q.c | |
| parent | 87d61912c23a746ee9a8a8d2fe17af217c87f761 (diff) | |
| download | lwn-8df0d77d8ce065ef536676fb4e1f36bfbf1dd809.tar.gz lwn-8df0d77d8ce065ef536676fb4e1f36bfbf1dd809.zip | |
USB: EHCI: improvements to unlink_empty_async_suspended()
unlink_empty_async_suspended() is marked __maybe_unused. This is
because its caller, ehci_bus_suspend(), is protected by "#ifdef
CONFIG_PM". We should use the same protection here instead of
__maybe_unused.
unlink_empty_async_suspended() gets called only when the root hub is
suspended. It's silly for it to call start_iaa_cycle() at such a
time; the IAA mechanism doesn't work when the root hub isn't running.
It should call end_unlink_async() instead. But even this isn't
necessary, since there already is a call to end_iaa_cycle() right
before the call to unlink_empty_async_suspended(). All we have to do
is interchange the two subroutine calls.
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-q.c')
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index a24341ef863d..eca3710d8fc4 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -1459,8 +1459,10 @@ static void unlink_empty_async(struct ehci_hcd *ehci) } } +#ifdef CONFIG_PM + /* The root hub is suspended; unlink all the async QHs */ -static void __maybe_unused unlink_empty_async_suspended(struct ehci_hcd *ehci) +static void unlink_empty_async_suspended(struct ehci_hcd *ehci) { struct ehci_qh *qh; @@ -1469,9 +1471,10 @@ static void __maybe_unused unlink_empty_async_suspended(struct ehci_hcd *ehci) WARN_ON(!list_empty(&qh->qtd_list)); single_unlink_async(ehci, qh); } - start_iaa_cycle(ehci); } +#endif + /* makes sure the async qh will become idle */ /* caller must own ehci->lock */ |