Re: [PATCH] Revert "usb: Reset USB-3 devices on USB-3 link bounce"
Hi,
On 26-01-15 16:30, Zhuang Jin Can wrote:
This revert a82b76f7fa6154e8ab2d8071842a3e38b9c0d0ff.
The commit causes an extra reset in remote wakeup as described in:
http://www.spinics.net/lists/linux-usb/msg119080.html
Signed-off-by: Zhuang Jin Can
No objection from me (*) against reverting this, as it was fixing a
rather obscure (but non the less real) issue, and the issue it
causes seems to be a bigger one.
Regards,
Hans
*) I'm the author of the original patch
---
drivers/usb/core/hub.c | 34 +-
1 file changed, 9 insertions(+), 25 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index aeb50bb..89d009a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4882,7 +4882,7 @@ static void hub_port_connect_change(struct usb_hub *hub,
int port1,
static void port_event(struct usb_hub *hub, int port1)
__must_hold(&port_dev->status_lock)
{
- int connect_change, reset_device = 0;
+ int connect_change;
struct usb_port *port_dev = hub->ports[port1 - 1];
struct usb_device *udev = port_dev->child;
struct usb_device *hdev = hub->hdev;
@@ -4970,30 +4970,14 @@ static void port_event(struct usb_hub *hub, int port1)
if (hub_port_reset(hub, port1, NULL,
HUB_BH_RESET_TIME, true) < 0)
hub_port_disable(hub, port1, 1);
- } else
- reset_device = 1;
- }
-
- /*
-* On disconnect USB3 protocol ports transit from U0 to
-* SS.Inactive to Rx.Detect. If this happens a warm-
-* reset is not needed, but a (re)connect may happen
-* before hub_wq runs and sees the disconnect, and the
-* device may be an unknown state.
-*
-* If the port went through SS.Inactive without hub_wq
-* seeing it the C_LINK_STATE change flag will be set,
-* and we reset the dev to put it in a known state.
-*/
- if (reset_device || (udev && hub_is_superspeed(hub->hdev)
- && (portchange & USB_PORT_STAT_C_LINK_STATE)
- && (portstatus & USB_PORT_STAT_CONNECTION))) {
- usb_unlock_port(port_dev);
- usb_lock_device(udev);
- usb_reset_device(udev);
- usb_unlock_device(udev);
- usb_lock_port(port_dev);
- connect_change = 0;
+ } else {
+ usb_unlock_port(port_dev);
+ usb_lock_device(udev);
+ usb_reset_device(udev);
+ usb_unlock_device(udev);
+ usb_lock_port(port_dev);
+ connect_change = 0;
+ }
}
if (connect_change)
--
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[PATCH] Revert "usb: Reset USB-3 devices on USB-3 link bounce"
This revert a82b76f7fa6154e8ab2d8071842a3e38b9c0d0ff.
The commit causes an extra reset in remote wakeup as described in:
http://www.spinics.net/lists/linux-usb/msg119080.html
Signed-off-by: Zhuang Jin Can
---
drivers/usb/core/hub.c | 34 +-
1 file changed, 9 insertions(+), 25 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index aeb50bb..89d009a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4882,7 +4882,7 @@ static void hub_port_connect_change(struct usb_hub *hub,
int port1,
static void port_event(struct usb_hub *hub, int port1)
__must_hold(&port_dev->status_lock)
{
- int connect_change, reset_device = 0;
+ int connect_change;
struct usb_port *port_dev = hub->ports[port1 - 1];
struct usb_device *udev = port_dev->child;
struct usb_device *hdev = hub->hdev;
@@ -4970,30 +4970,14 @@ static void port_event(struct usb_hub *hub, int port1)
if (hub_port_reset(hub, port1, NULL,
HUB_BH_RESET_TIME, true) < 0)
hub_port_disable(hub, port1, 1);
- } else
- reset_device = 1;
- }
-
- /*
-* On disconnect USB3 protocol ports transit from U0 to
-* SS.Inactive to Rx.Detect. If this happens a warm-
-* reset is not needed, but a (re)connect may happen
-* before hub_wq runs and sees the disconnect, and the
-* device may be an unknown state.
-*
-* If the port went through SS.Inactive without hub_wq
-* seeing it the C_LINK_STATE change flag will be set,
-* and we reset the dev to put it in a known state.
-*/
- if (reset_device || (udev && hub_is_superspeed(hub->hdev)
- && (portchange & USB_PORT_STAT_C_LINK_STATE)
- && (portstatus & USB_PORT_STAT_CONNECTION))) {
- usb_unlock_port(port_dev);
- usb_lock_device(udev);
- usb_reset_device(udev);
- usb_unlock_device(udev);
- usb_lock_port(port_dev);
- connect_change = 0;
+ } else {
+ usb_unlock_port(port_dev);
+ usb_lock_device(udev);
+ usb_reset_device(udev);
+ usb_unlock_device(udev);
+ usb_lock_port(port_dev);
+ connect_change = 0;
+ }
}
if (connect_change)
--
1.7.9.5
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