Commit 51df62ff authored Jul 04, 2014 by Pratyush Anand Committed by Greg Kroah-Hartman Jul 09, 2014

usb: allow lpm (en/dis)able only if device is atleast in default state



When a USB device is disconnected, usb_unbind_interface is called, which
tries to enable and disable LPM. usb_enable_lpm also try to send a
control command SET SEL to the device.
Since device is already disconnected, therefore it does not make sense
to execute usb_(en/dis)able_lpm.
This patch returns from usb_(en/dis)able_lpm, if device was not in
default state atleast.

Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Tested-by: Aymen Bouattay <aymen.bouattay@st.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent b2f463e1

drivers/usb/core/hub.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -3860,7 +3860,8 @@ int usb_disable_lpm(struct usb_device *udev)

		if (!udev \|\| !udev->parent \|\|
		udev->speed != USB_SPEED_SUPER \|\|
		!udev->lpm_capable)
		!udev->lpm_capable \|\|
		udev->state < USB_STATE_DEFAULT)
		return 0;

		hcd = bus_to_hcd(udev->bus);
		@@ -3916,7 +3917,8 @@ void usb_enable_lpm(struct usb_device *udev)

		if (!udev \|\| !udev->parent \|\|
		udev->speed != USB_SPEED_SUPER \|\|
		!udev->lpm_capable)
		!udev->lpm_capable \|\|
		udev->state < USB_STATE_DEFAULT)
		return;

		udev->lpm_disable_count--;