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authorAlan Stern <stern@rowland.harvard.edu>2008-08-20 17:22:05 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-08-21 10:26:38 -0700
commitb5fb454f69642f9d933b327b185a2ba06dd0945c (patch)
treeaa68acda039477c8d6411ed3e0fe78d3f9098071 /drivers/usb/core/hcd.c
parent5096aedcd2eb70fbea83f09281f97f9ec973d9de (diff)
downloadlinux-b5fb454f69642f9d933b327b185a2ba06dd0945c.tar.bz2
USB: automatically enable RHSC interrupts
This patch (as1069c) changes the way OHCI root-hub status-change interrupts are enabled. Currently a special HCD method, hub_irq_enable(), is called when the hub driver is finished using a root hub. This approach turns out to be subject to races, resulting in unnecessary polling. The patch does away with the method entirely. Instead, the driver automatically enables the RHSC interrupt when no more status changes are present. This scheme is safe with controllers using level-triggered semantics for their interrupt flags. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hcd.c')
-rw-r--r--drivers/usb/core/hcd.c9
1 files changed, 0 insertions, 9 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index f7bfd72ef115..8abd4e59bf4a 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -924,15 +924,6 @@ static int register_root_hub(struct usb_hcd *hcd)
return retval;
}
-void usb_enable_root_hub_irq (struct usb_bus *bus)
-{
- struct usb_hcd *hcd;
-
- hcd = container_of (bus, struct usb_hcd, self);
- if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT)
- hcd->driver->hub_irq_enable (hcd);
-}
-
/*-------------------------------------------------------------------------*/