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| author | Alan Stern <stern@rowland.harvard.edu> | 2015-01-29 23:05:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <greg@kroah.com> | 2015-01-31 20:05:06 +0300 |
| commit | 074f9dd55f9cab1b82690ed7e44bcf38b9616ce0 (patch) | |
| tree | 5ef4e9054a862b930cd75f394f2c0a62e14361b2 /drivers/usb/core | |
| parent | 3f2cee73b650921b2e214bf487b2061a1c266504 (diff) | |
| download | linux-074f9dd55f9cab1b82690ed7e44bcf38b9616ce0.tar.xz | |
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) dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); return -EOPNOTSUPP; } + + /* + * If the device is a direct child of the root hub and the HCD + * doesn't handle wakeup requests, don't allow autosuspend when + * wakeup is needed. + */ + if (w && udev->parent == udev->bus->root_hub && + bus_to_hcd(udev->bus)->cant_recv_wakeups) { + dev_dbg(&udev->dev, "HCD doesn't handle wakeup requests\n"); + return -EOPNOTSUPP; + } + udev->do_remote_wakeup = w; return 0; } |