diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2011-07-01 16:43:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-07-08 23:15:37 -0700 |
| commit | 042fe1a2805b175b318db0fa10cf8c9df192fa7c (patch) | |
| tree | fb17ac6c02c7c8805edc9c4194656d683af6a9a7 | |
| parent | 8c603fc5c6608bac3e3df537f8f4a70a24e4edd0 (diff) | |
USB: fix regression occurring during device removal
commit e534c5b831c8b8e9f5edee5c8a37753c808b80dc upstream.
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@rowland.harvard.edu>
Tested-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | 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 64c7ab4702df..e0719b4ee189 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) { |