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USB: add flag for HCDs that can't receive wakeup requests (isp1760-hcd)

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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 <[email protected]>
Tested-by: Nicolas Pitre <[email protected]>
CC: <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Alan Stern 2015-01-29 15:05:04 -05:00 • committed by Greg Kroah-Hartman
commit 074f9dd55f
3 changed files with 17 additions and 0 deletions
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12
drivers/usb/core/driver.c
View file

@ -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;
}

3
drivers/usb/host/isp1760-hcd.c
View file

@ -2245,6 +2245,9 @@ struct usb_hcd *isp1760_register(phys_addr_t res_start, resource_size_t res_len,
hcd->rsrc_start = res_start;
hcd->rsrc_len = res_len;
/* This driver doesn't support wakeup requests */
hcd->cant_recv_wakeups = 1;
ret = usb_add_hcd(hcd, irq, irqflags);
if (ret)
goto err_unmap;