From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
This patch (as1476) fixes a regression introduced by
fccf4e86200b8f5edd9a65da26f150e32ba79808 (USB: Free bandwidth when
usb_disable_device is called). usb_disconnect() grabs the
bandwidth_mutex before calling usb_disable_device(), which calls down
indirectly to usb_set_interface(), which tries to acquire the
bandwidth_mutex.
The fix causes usb_set_interface() to return early when it is called
for an interface that has already been unregistered, which is what
happens in usb_disable_device().
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Tested-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/core/message.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 64c7ab4..e0719b4 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1286,6 +1286,8 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
interface);
return -EINVAL;
}
+ if (iface->unregistering)
+ return -ENODEV;
alt = usb_altnum_to_altsetting(iface, alternate);
if (!alt) {
--
1.7.6
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