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USB: Fix connected device switch to Inactive state.

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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>
This commit is contained in:
Sarah Sharp 2012-11-01 11:20:44 -07:00
parent a24a607875
commit d3b9d7a905
1 changed files with 25 additions and 5 deletions
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30
drivers/usb/core/hub.c
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@ -2605,7 +2605,6 @@ 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);
@ -2639,6 +2638,18 @@ 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 */
@ -4690,12 +4701,21 @@ static void hub_events(void)
*/
if (hub_port_warm_reset_required(hub, portstatus)) {
int status;
struct usb_device *udev =
hub->ports[i - 1]->child;
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;
}