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usb: hub: Prevent hub autosuspend if usbcore.autosuspend is -1 

If user specifies that USB autosuspend must be disabled by module
parameter "usbcore.autosuspend=-1" then we must prevent
autosuspend of USB hub devices as well.

commit 596d789a21 introduced in v3.8 changed the original behaivour
and stopped respecting the usbcore.autosuspend parameter for hubs.

Fixes: 596d789a21 "USB: set hub's default autosuspend delay as 0"

Cc: [3.8+] <stable@vger.kernel.org>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Tested-by: Michael Welling <mwelling@emacinc.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roger Quadros 2014-08-04 12:44:46 +03:00 committed by Greg Kroah-Hartman
parent 5b6b80aeb2
commit bdd405d2a5
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/core/hub.c
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@ -1728,8 +1728,12 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
* - Change autosuspend delay of hub can avoid unnecessary auto
* suspend timer for hub, also may decrease power consumption
* of USB bus.
*
* - If user has indicated to prevent autosuspend by passing
* usbcore.autosuspend = -1 then keep autosuspend disabled.
*/
pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
if (hdev->dev.power.autosuspend_delay >= 0)
pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
/*
* Hubs have proper suspend/resume support, except for root hubs