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 <st...@rowland.harvard.edu>
---
v2: This patch is new; it didn't appear in v1.
[as1796]
drivers/usb/host/ehci-hub.c | 3 ++-
drivers/usb/host/ehci-q.c | 7 +++++--
2 files changed, 7 insertions(+), 3 deletions(-)
Index: usb-4.4/drivers/usb/host/ehci-hub.c
===================================================================
--- usb-4.4.orig/drivers/usb/host/ehci-hub.c
+++ usb-4.4/drivers/usb/host/ehci-hub.c
@@ -347,9 +347,10 @@ static int ehci_bus_suspend (struct usb_
goto done;
ehci->rh_state = EHCI_RH_SUSPENDED;
+ unlink_empty_async_suspended(ehci);
+
/* Any IAA cycle that started before the suspend is now invalid */
end_iaa_cycle(ehci);
- unlink_empty_async_suspended(ehci);
ehci_handle_start_intr_unlinks(ehci);
ehci_handle_intr_unlinks(ehci);
end_free_itds(ehci);
Index: usb-4.4/drivers/usb/host/ehci-q.c
===================================================================
--- usb-4.4.orig/drivers/usb/host/ehci-q.c
+++ usb-4.4/drivers/usb/host/ehci-q.c
@@ -1459,8 +1459,10 @@ static void unlink_empty_async(struct eh
}
}
+#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_
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 */
--
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