diff options
| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2013-03-13 10:59:21 -0700 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2013-03-13 18:17:19 +0000 |
| commit | 0cf6a2061de8932fe7da053ab09d87eee330fd40 (patch) | |
| tree | 3e32b021e5f9fe083b65f7cd9f1733921f29ff4f | |
| parent | e1ca75928b1e600cf02f80a7cede2b6d5e4f2fde (diff) | |
USB: Fix connected device switch to Inactive state.
commit d3b9d7a9051d7024a93c76a84b2f84b3b66ad6d5 upstream.
[This is upstream commit d3b9d7a9051d7024a93c76a84b2f84b3b66ad6d5.
It needs to be backported to kernels as old as 3.2, because it fixes the
buggy commit 9dbcaec830cd97f44a0b91b315844e0d7144746b "USB: Handle warm
reset failure on empty port."]
A USB 3.0 device can transition to the Inactive state if a U1 or U2 exit
transition fails. The current code in hub_events simply issues a warm
reset, but does not call any pre-reset or post-reset driver methods (or
unbind/rebind drivers without them). Therefore the drivers won't know
their device has just been reset.
hub_events should instead call usb_reset_device. This means
hub_port_reset now needs to figure out whether it should issue a warm
reset or a hot reset.
Remove the FIXME note about needing disconnect() for a NOTATTACHED
device. This patch fixes that.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
| -rw-r--r-- | drivers/usb/core/hub.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index fc9788f4de0b..9d7078838edf 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2496,7 +2496,6 @@ static void hub_port_finish_reset(struct usb_hub *hub, int port1, case -ENODEV: clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_RESET); - /* FIXME need disconnect() for NOTATTACHED device */ if (hub_is_superspeed(hub->hdev)) { clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_BH_PORT_RESET); @@ -2530,6 +2529,18 @@ static int hub_port_reset(struct usb_hub *hub, int port1, * Some companion controllers don't like it when they mix. */ down_read(&ehci_cf_port_reset_rwsem); + } else if (!warm) { + /* + * If the caller hasn't explicitly requested a warm reset, + * double check and see if one is needed. + */ + status = hub_port_status(hub, port1, + &portstatus, &portchange); + if (status < 0) + goto done; + + if (hub_port_warm_reset_required(hub, portstatus)) + warm = true; } /* Reset the port */ @@ -4528,12 +4539,21 @@ static void hub_events(void) */ if (hub_port_warm_reset_required(hub, portstatus)) { int status; + struct usb_device *udev = + hub->hdev->children[i - 1]; dev_dbg(hub_dev, "warm reset port %d\n", i); - status = hub_port_reset(hub, i, NULL, - HUB_BH_RESET_TIME, true); - if (status < 0) - hub_port_disable(hub, i, 1); + if (!udev) { + status = hub_port_reset(hub, i, + NULL, HUB_BH_RESET_TIME, + true); + if (status < 0) + hub_port_disable(hub, i, 1); + } else { + usb_lock_device(udev); + status = usb_reset_device(udev); + usb_unlock_device(udev); + } connect_change = 0; } |