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USB: Fix NEC OHCI chip silicon bug

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This patch fixes a silicon bug in some NEC OHCI chips. The bug appears
at random times and is very, very difficult to reproduce. Without the
following patch, Linux would shut the chip and its associated devices
down. In Apple PowerBooks this leads to an unusable keyboard and mouse
(SSH still working). The idea of restarting the chip is taken from
public Darwin code.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hanselmann
2007-05-31 23:34:27 +02:00
committed by Greg Kroah-Hartman
parent 020363384a
commit d576bb9f27
5 changed files with 61 additions and 14 deletions
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5
drivers/usb/host/ohci-hub.c
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@@ -55,8 +55,6 @@ static void dl_done_list (struct ohci_hcd *);
static void finish_unlinks (struct ohci_hcd *, u16);
#ifdef CONFIG_PM
static int ohci_restart(struct ohci_hcd *ohci);
static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
__releases(ohci->lock)
__acquires(ohci->lock)
@@ -191,6 +189,9 @@ __acquires(ohci->lock)
spin_unlock_irq (&ohci->lock);
(void) ohci_init (ohci);
status = ohci_restart (ohci);
usb_root_hub_lost_power(hcd->self.root_hub);
spin_lock_irq (&ohci->lock);
}
return status;