diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-06 10:27:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-06 10:27:25 -0700 |
| commit | 09ca8adbe9f724a7e96f512c0039c4c4a1c5dcc0 (patch) | |
| tree | d9eccc5f23b8565fc93ddcecd6a480d21bbbcebb /drivers/usb/core/hcd.c | |
| parent | b7279469d66b55119784b8b9529c99c1955fe747 (diff) | |
Revert "USB: don't explicitly reenable root-hub status interrupts"
This reverts commit e872154921a6b5256a3c412dd69158ac0b135176.
Andrey Borzenkov reports that it resulted in a totally hung machine for
him when loading the OHCI driver. Extensive netconsole capture with
SysRq output shows that modprobe gets stuck in ohci_hub_status_data()
when probing and enabling the OHCI controller, see for example
http://lkml.org/lkml/2008/7/5/236
for an analysis.
The problem appears to be an interrupt flood triggered by the commit
that gets reverted, and Andrey confirmed that the revert makes things
work for him again.
Reported-and-tested-by: Andrey Borzenkov <arvidjaar@mail.ru>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <david-b@pacbell.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb/core/hcd.c')
| -rw-r--r-- | drivers/usb/core/hcd.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 7158dbb6e4b..42a436478b7 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -924,6 +924,15 @@ 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); +} + /*-------------------------------------------------------------------------*/ |