diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2015-01-29 15:05:04 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <greg@kroah.com> | 2015-01-31 12:05:06 -0500 |
| commit | 074f9dd55f9cab1b82690ed7e44bcf38b9616ce0 (patch) | |
| tree | 5ef4e9054a862b930cd75f394f2c0a62e14361b2 /drivers/usb/core | |
| parent | 3f2cee73b650921b2e214bf487b2061a1c266504 (diff) | |
USB: add flag for HCDs that can't receive wakeup requests (isp1760-hcd)
Currently the USB stack assumes that all host controller drivers are
capable of receiving wakeup requests from downstream devices.
However, this isn't true for the isp1760-hcd driver, which means that
it isn't safe to do a runtime suspend of any device attached to a
root-hub port if the device requires wakeup.
This patch adds a "cant_recv_wakeups" flag to the usb_hcd structure
and sets the flag in isp1760-hcd. The core is modified to prevent a
direct child of the root hub from being put into runtime suspend with
wakeup enabled if the flag is set.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Nicolas Pitre <nico@linaro.org>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/driver.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index c76ec9758ce3..818369afff63 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c | |||
| @@ -1780,6 +1780,18 @@ static int autosuspend_check(struct usb_device *udev) | |||
| 1780 | dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); | 1780 | dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); |
| 1781 | return -EOPNOTSUPP; | 1781 | return -EOPNOTSUPP; |
| 1782 | } | 1782 | } |
| 1783 | |||
| 1784 | /* | ||
| 1785 | * If the device is a direct child of the root hub and the HCD | ||
| 1786 | * doesn't handle wakeup requests, don't allow autosuspend when | ||
| 1787 | * wakeup is needed. | ||
| 1788 | */ | ||
| 1789 | if (w && udev->parent == udev->bus->root_hub && | ||
| 1790 | bus_to_hcd(udev->bus)->cant_recv_wakeups) { | ||
| 1791 | dev_dbg(&udev->dev, "HCD doesn't handle wakeup requests\n"); | ||
| 1792 | return -EOPNOTSUPP; | ||
| 1793 | } | ||
| 1794 | |||
| 1783 | udev->do_remote_wakeup = w; | 1795 | udev->do_remote_wakeup = w; |
| 1784 | return 0; | 1796 | return 0; |
| 1785 | } | 1797 | } |