This is a note to let you know that I've just added the patch titled
USB: Prepare for refactoring by adding extra udev checks.
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-prepare-for-refactoring-by-adding-extra-udev-checks.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Tue Mar 12 14:58:36 2013
From: Sarah Sharp <[email protected]>
Date: Thu, 7 Mar 2013 16:23:34 -0800
Subject: USB: Prepare for refactoring by adding extra udev checks.
To: Greg KH <[email protected]>
Cc: [email protected]
Message-ID: <20130308002334.GA13297@xanatos>
From: Sarah Sharp <[email protected]>
[This is upstream commit 2d4fa940f99663c82ba55b2244638833b388e4e2.
It needs to be backported to kernels as old as 3.2, because it fixes the
buggy commit 65bdac5effd15d6af619b3b7218627ef4d84ed6a "USB: Handle warm
reset failure on empty port."]
The next patch will refactor the hub port code to rip out the recursive
call to hub_port_reset on a failed hot reset. In preparation for that,
make sure all code paths can deal with being called with a NULL udev.
The usb_device will not be valid if warm reset was issued because a port
transitioned to the Inactive or Compliance Mode on a device connect.
This patch should have no effect on current behavior.
Signed-off-by: Sarah Sharp <[email protected]>
Acked-by: Alan Stern <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/core/hub.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2584,6 +2584,9 @@ static int hub_port_wait_reset(struct us
return -ENOTCONN;
if ((portstatus & USB_PORT_STAT_ENABLE)) {
+ if (!udev)
+ return 0;
+
if (hub_is_wusb(hub))
udev->speed = USB_SPEED_WIRELESS;
else if (hub_is_superspeed(hub->hdev))
@@ -2627,13 +2630,15 @@ static void hub_port_finish_reset(struct
struct usb_hcd *hcd;
/* TRSTRCY = 10 ms; plus some extra */
msleep(10 + 40);
- update_devnum(udev, 0);
- hcd = bus_to_hcd(udev->bus);
- /* The xHC may think the device is already reset,
- * so ignore the status.
- */
- if (hcd->driver->reset_device)
- hcd->driver->reset_device(hcd, udev);
+ if (udev) {
+ update_devnum(udev, 0);
+ hcd = bus_to_hcd(udev->bus);
+ /* The xHC may think the device is already
+ * reset, so ignore the status.
+ */
+ if (hcd->driver->reset_device)
+ hcd->driver->reset_device(hcd, udev);
+ }
}
/* FALL THROUGH */
case -ENOTCONN:
@@ -2647,7 +2652,7 @@ static void hub_port_finish_reset(struct
clear_port_feature(hub->hdev, port1,
USB_PORT_FEAT_C_PORT_LINK_STATE);
}
- if (!warm)
+ if (!warm && udev)
usb_set_device_state(udev, *status
? USB_STATE_NOTATTACHED
: USB_STATE_DEFAULT);
Patches currently in stable-queue which might be from
[email protected] are
queue-3.8/usb-don-t-use-ehci-port-sempahore-for-usb-3.0-hubs.patch
queue-3.8/usb-rip-out-recursive-call-on-warm-port-reset.patch
queue-3.8/usb-prepare-for-refactoring-by-adding-extra-udev-checks.patch
queue-3.8/usb-fix-connected-device-switch-to-inactive-state.patch
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