diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2012-07-11 11:23:10 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 16:56:48 -0700 |
| commit | c4f3476436f7452b97c8accb5dd7d53219a11a3f (patch) | |
| tree | 95711a24bb4357dab53d4641aae5a09292974fb8 /drivers/usb/host/ehci-tegra.c | |
| parent | f42890782241a60d107f23d08089a4a12b507a11 (diff) | |
| download | blackbird-obmc-linux-c4f3476436f7452b97c8accb5dd7d53219a11a3f.tar.gz blackbird-obmc-linux-c4f3476436f7452b97c8accb5dd7d53219a11a3f.zip | |
USB: EHCI: fix up locking
This patch (as1588) adjusts the locking in ehci-hcd's various halt,
shutdown, and suspend/resume pathways. We want to hold the spinlock
while writing device registers and accessing shared variables, but not
while polling in a loop.
In addition, there's no need to call ehci_work() at times when no URBs
can be active, i.e., in ehci_stop() and ehci_bus_suspend().
Finally, ehci_adjust_port_wakeup_flags() is called only in situations
where interrupts are enabled; therefore it can use spin_lock_irq
rather than spin_lock_irqsave.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-tegra.c')
| -rw-r--r-- | drivers/usb/host/ehci-tegra.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c index f7f3ce3275b8..65360945df78 100644 --- a/drivers/usb/host/ehci-tegra.c +++ b/drivers/usb/host/ehci-tegra.c @@ -445,12 +445,11 @@ static int controller_suspend(struct device *dev) if (time_before(jiffies, ehci->next_statechange)) msleep(10); - spin_lock_irqsave(&ehci->lock, flags); + ehci_halt(ehci); + spin_lock_irqsave(&ehci->lock, flags); tegra->port_speed = (readl(&hw->port_status[0]) >> 26) & 0x3; - ehci_halt(ehci); clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - spin_unlock_irqrestore(&ehci->lock, flags); tegra_ehci_power_down(hcd); |
