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usb: core: hub: modify hub reset logic in hub driver

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Currently if port power is turned off by user on hub port
using USBDEVFS then port power is turned back ON
by hub driver.
This commit modifies hub reset logic in hub_port_connect() to prevent
hub driver from turning back the port power ON if port is not owned
by kernel.

Signed-off-by: Deepak Das <deepakdas.linux@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Deepak Das 2015-01-21 23:39:58 +05:30 committed by Greg Kroah-Hartman
parent 7e7a0e67f2
commit fbaecff06a
1 changed files with 6 additions and 2 deletions
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8
drivers/usb/core/hub.c
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@ -4655,9 +4655,13 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
test_bit(port1, hub->removed_bits)) {
/* maybe switch power back on (e.g. root hub was reset) */
/*
* maybe switch power back on (e.g. root hub was reset)
* but only if the port isn't owned by someone else.
*/
if (hub_is_port_power_switchable(hub)
&& !port_is_power_on(hub, portstatus))
&& !port_is_power_on(hub, portstatus)
&& !port_dev->port_owner)
set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
if (portstatus & USB_PORT_STAT_ENABLE)