[PATCH 3.12 026/142] usb: hub: Prevent hub autosuspend if usbcore.autosuspend is -1

From: Jiri Slaby
Date: Fri Sep 26 2014 - 06:36:00 EST


From: Roger Quadros <rogerq@xxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit bdd405d2a5287bdb9b04670ea255e1f122138e66 upstream.

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"

Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Tested-by: Michael Welling <mwelling@xxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/usb/core/hub.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 557e8a9fe58a..156fe93fb3d9 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1704,8 +1704,12 @@ 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
--
2.1.0

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