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Message-ID: <1407145486-14013-1-git-send-email-rogerq@ti.com> Date: Mon, 4 Aug 2014 12:44:46 +0300 From: Roger Quadros <rogerq@...com> To: <gregkh@...uxfoundation.org>, <stern@...land.harvard.edu> CC: <balbi@...com>, <ming.lei@...onical.com>, <mwelling@...cinc.com>, <stefan@...brechtsmeier.net>, <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>, "[3.8+]" <stable@...r.kernel.org> Subject: [PATCH] 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@...r.kernel.org> Signed-off-by: Roger Quadros <rogerq@...com> --- 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 0e950ad..a287cd5 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 -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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