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| author | Jan-Marek Glogowski <glogow@fbihome.de> | 2019-02-01 13:52:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-08 10:21:22 +0100 |
| commit | 4fdc1790e6a9ef22399c6bc6e63b80f4609f3b7e (patch) | |
| tree | a21ea27da696a856a796c1766309b5ae0a139e5e /drivers/usb/core | |
| parent | 68f1ec8ea14f5dcb91df6258e482afcb41610b2e (diff) | |
| download | linux-4fdc1790e6a9ef22399c6bc6e63b80f4609f3b7e.tar.gz linux-4fdc1790e6a9ef22399c6bc6e63b80f4609f3b7e.tar.bz2 linux-4fdc1790e6a9ef22399c6bc6e63b80f4609f3b7e.zip | |
usb: handle warm-reset port requests on hub resume
On plug-in of my USB-C device, its USB_SS_PORT_LS_SS_INACTIVE
link state bit is set. Greping all the kernel for this bit shows
that the port status requests a warm-reset this way.
This just happens, if its the only device on the root hub, the hub
therefore resumes and the HCDs status_urb isn't yet available.
If a warm-reset request is detected, this sets the hubs event_bits,
which will prevent any auto-suspend and allows the hubs workqueue
to warm-reset the port later in port_event.
Signed-off-by: Jan-Marek Glogowski <glogow@fbihome.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hub.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index bb0830c72286..8d4631c81b9f 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -108,6 +108,8 @@ EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); static void hub_release(struct kref *kref); static int usb_reset_and_verify_device(struct usb_device *udev); static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); +static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, + u16 portstatus); static inline char *portspeed(struct usb_hub *hub, int portstatus) { @@ -1137,6 +1139,11 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) USB_PORT_FEAT_ENABLE); } + /* Make sure a warm-reset request is handled by port_event */ + if (type == HUB_RESUME && + hub_port_warm_reset_required(hub, port1, portstatus)) + set_bit(port1, hub->event_bits); + /* * Add debounce if USB3 link is in polling/link training state. * Link will automatically transition to Enabled state after |