From: Deepak Das <deepakdas.linux@xxxxxxxxx>
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@xxxxxxxxx>
---
drivers/usb/core/hub.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index b649fef..6f12de7 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4657,9 +4657,13 @@ 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)
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
