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authorRoger Quadros <rogerq@ti.com>2014-08-04 12:44:46 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-08-26 15:59:14 -0700
commitbdd405d2a5287bdb9b04670ea255e1f122138e66 (patch)
parent5b6b80aeb21091ed3030b9b6aae597d81326f1aa (diff)
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 596d789a211d introduced in v3.8 changed the original behaivour and stopped respecting the usbcore.autosuspend parameter for hubs. Fixes: 596d789a211d "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>
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 97deb8e6b594..003cb6b1a6bf 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -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