From 752d57a8b7b97423bffa3452638aa0fd3c3bb9d1 Mon Sep 17 00:00:00 2001 From: Paul Bolle Date: Fri, 11 Mar 2011 18:03:52 +0100 Subject: [PATCH] USB: Only treat lasting over-current conditions as errors On a laptop I see these errors on (most) resumes: hub 3-0:1.0: over-current change on port 1 hub 3-0:1.0: over-current change on port 2 Since over-current conditions can disappear quite quickly it's better to downgrade that message to debug level, recheck for an over-current condition a little later and only print and over-current condition error if that condition (still) exists when it's rechecked. Add similar logic to hub over-current changes. (That code is untested, as those changes do not occur on this laptop.) Signed-off-by: Paul Bolle Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 24 +++++++++++++++++++----- 1 file changed, 19 insertions(+), 5 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 395754e..b574f91 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3408,12 +3408,19 @@ static void hub_events(void) } if (portchange & USB_PORT_STAT_C_OVERCURRENT) { - dev_err (hub_dev, - "over-current change on port %d\n", - i); + u16 status = 0; + u16 unused; + + dev_dbg(hub_dev, "over-current change on port " + "%d\n", i); clear_port_feature(hdev, i, USB_PORT_FEAT_C_OVER_CURRENT); + msleep(100); /* Cool down */ hub_power_on(hub, true); + hub_port_status(hub, i, &status, &unused); + if (status & USB_PORT_STAT_OVERCURRENT) + dev_err(hub_dev, "over-current " + "condition on port %d\n", i); } if (portchange & USB_PORT_STAT_C_RESET) { @@ -3445,10 +3452,17 @@ static void hub_events(void) hub->limited_power = 0; } if (hubchange & HUB_CHANGE_OVERCURRENT) { - dev_dbg (hub_dev, "overcurrent change\n"); - msleep(500); /* Cool down */ + u16 status = 0; + u16 unused; + + dev_dbg(hub_dev, "over-current change\n"); clear_hub_feature(hdev, C_HUB_OVER_CURRENT); + msleep(500); /* Cool down */ hub_power_on(hub, true); + hub_hub_status(hub, &status, &unused); + if (status & HUB_STATUS_OVERCURRENT) + dev_err(hub_dev, "over-current " + "condition\n"); } } -- 2.7.4