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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2012-05-09 10:48:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-09 15:22:27 -0700 |
| commit | 07e4e556eff4938eb2edf2591de3aa7d7fb82b52 (patch) | |
| tree | 07d5ec15744d1b6a764d55fe696791c4577d6329 /drivers/usb/host/ohci-at91.c | |
| parent | 7a82f612fa3aadb5676184ae202903f5a42e4f4a (diff) | |
| download | linux-stable-07e4e556eff4938eb2edf2591de3aa7d7fb82b52.tar.gz linux-stable-07e4e556eff4938eb2edf2591de3aa7d7fb82b52.tar.bz2 linux-stable-07e4e556eff4938eb2edf2591de3aa7d7fb82b52.zip | |
USB: ohci-at91: add a reset function to fix race condition
A possible race condition appears because we are not initializing
the ohci->regs before calling usb_hcd_request_irqs().
We move the call to ohci_init() in hcd->driver->reset() instead of
hcd->driver->start() to fix this.
This was experienced when we share the same IRQ line between OHCI and EHCI
controllers.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Tested-by: Christian Eggers <christian.eggers@kathrein.de>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ohci-at91.c')
| -rw-r--r-- | drivers/usb/host/ohci-at91.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index d4608c2d5b64..a665b3eaa746 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -223,7 +223,7 @@ static void __devexit usb_hcd_at91_remove(struct usb_hcd *hcd, /*-------------------------------------------------------------------------*/ static int __devinit -ohci_at91_start (struct usb_hcd *hcd) +ohci_at91_reset (struct usb_hcd *hcd) { struct at91_usbh_data *board = hcd->self.controller->platform_data; struct ohci_hcd *ohci = hcd_to_ohci (hcd); @@ -233,6 +233,14 @@ ohci_at91_start (struct usb_hcd *hcd) return ret; ohci->num_ports = board->ports; + return 0; +} + +static int __devinit +ohci_at91_start (struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci (hcd); + int ret; if ((ret = ohci_run(ohci)) < 0) { dev_err(hcd->self.controller, "can't start %s\n", @@ -419,6 +427,7 @@ static const struct hc_driver ohci_at91_hc_driver = { /* * basic lifecycle operations */ + .reset = ohci_at91_reset, .start = ohci_at91_start, .stop = ohci_stop, .shutdown = ohci_shutdown, |